BOEVE‐DE PAUW, Jelle and Peter VAN PETEGEM. 2011. The effect of Flemish Eco‐Schools on student environmental knowledge, attitudes, and affect. International Journal of Science Education, 33(11): 1513–1538. https://doi.org/10.1080/09500693.2010.540725

BOGNER, Franz. X. and Michael WISEMAN. 1999. Toward measuring adolescent environmental perception. European Psychologist, 4: 139–151. https://doi.org/10.1027//1016-9040.4.3.139

BOGNER, Franz X. and Michael WISEMAN. 2002. Environmental perception: Factor profiles of extreme groups. European Psychologist, 7: 225–237. https://doi.org/10.1027//1016-9040.7.3.225

BOGNER, Franz X. and Michael WISEMAN. 2006. Adolescents’ attitudes towards nature and environment: Quantifying the 2-MEV model. Environmentalist, 26: 247–254. https://doi.org/10.1007/s10669-006-8660-9

CHAWLA, Louise and Debra F. CUSHING. 2007. Education for strategic environmental behavior. Environmental Education Research, 13(4), 437–452. https://doi.org/10.1080/13504620701581539

ČINČERA, Jan and Bruce JOHNSON. 2013. Earthkeepers in the Czech Republic: Experience from the implementation process. Envigogika, 8(4): 1-14. https://doi.org/10.14712/18023061.397

CLEVELAND, Mark, Maria KALAMAS and Michel LAROCHE. 2012. “It's not Easy Being Green”: Exploring Green Creeds, Green Deeds, and Internal Environmental Locus of Control. Psychology and Marketing, 29(5): 293-305. https://doi.org/10.1002/mar.20522

DRISSNER, Jurgen, Hans-Martin HAASE and Katrin HILLE. 2010. Short-term environmental education—Does it work?: An evaluation of the “Green Classroom.” Journal of Biological Education, 44: 149–155. https://doi.org/10.1080/00219266.2010.9656215

DUNLAP, Riley E., Kent D. VAN LIERE, Angela G. MERTIG, and Robert E. JONES. 2000. Measuring endorsement of the New Ecological Paradigm : A revised NEP scale. Journal of Social Sciences, 50: 425-442. https://doi.org/10.1111/0022-4537.00176

EVANS, Garry. W., Gernot BRAUCHLE, Aliya HAQ, Rachel STECKER, Kimberly WONG and Elan SHAPIRO. 2007. Young Children’s Environmental Attitudes and Behaviors. Environment and Behavior, 39, 635–658. https://doi.org/10.1177/0013916506294252

FELIX, Lisa and Bruce JOHNSON. 2007. Back in the classroom: Teacher influence on students’ environmental understandings, perceptions and actions following an earth education program. Paper presented at the annual meeting of the National Association for Research in Science Teaching, Baltimore, MD.

FELIX, Lisa, and Bruce JOHNSON. 2013. Back in the classroom: Teacher follow-through after an earth education program. Applied Environmental Education and Communication, 12(3): 187-196. https://doi.org/10.1080/1533015X.2013.838871

GAYFORD, Chris. 2009. Learning for sustainability: from the pupils’ perspective. WWF Research Report: UK.

HEIMLICH, Joe E. and Nicole M. ARDOIN. 2008. Understanding behavior to understand behavior change: a literature review. Environmental Education Research, 14(3): 215–237. https://doi.org/10.1080/13504620802148881

JAKSHA, Amanda and Bruce JOHNSON. 2014. A new theoretical framework for researching environmental identity. Paper presented at the annual meeting of the National Association for Research in Science Teaching, Pittsburgh, PA.

JENSEN, Bjarne. B. and Karsten SCHNACK. 2006. The action competence approach in environmental education. Environmental Education Research, 12(3-4), 471–486. https://doi.org/10.1080/13504620600943053

JOHNSON, Bruce. 2003. The role of experience in understanding, feeling, and processing. Zeitschrift Für Erlebnispädagogik, 23(5/6): 5-13.

JOHNSON, Bruce and Constantinos C. MANOLI. 2011. The 2-MEV scale in the United States: A measure of children's environmental attitudes based on the theory of ecological attitude. The Journal of Environmental Education, 42(2): 84-97. https://doi.org/10.1080/00958964.2010.503716

KAISER, Florian G., Nina ROCZEN and Franz X. BOGNER. 2008. Competence formation in environmental education: Development of an instrument for adolescents. Journal of Environmental Psychology, 27: 242-251. https://doi.org/10.1016/j.jenvp.2007.06.004

KALS, Elisabeth, Daniel SCHUMACHER and Leo MONTADA. 1999. Emotional Affinity toward Nature as a Motivational Basis to Protect Nature. Environment and Behavior, 31(2), 178-202. https://doi.org/10.1177/00139169921972056

KOLLMUS, Anja and Julian AGYEMAN. 2002. Mind the gap: why do people act environmentally and what are the barriers of proenvironmental behavior? Environmental Education Research, 8(3): 239-260. https://doi.org/10.1080/13504620220145401

MANOLI, Constantinos C. and Bruce JOHNSON. 2007. Investigating the relationship between children’s environmental perceptions and ecological actions through environmental learning experiences. Paper presented at the annual meeting of the National Association for Research in Science Teaching, New Orleans, LA.

MANOLI, Constantinos C., Bruce JOHNSON, and Riley E. DUNLAP. 2007. Assessing children’s environmental worldviews: Modifying and validating the New Ecological Paradigm Scale for use with children. Journal of Environmental Education, 38(4): 3–13. https://doi.org/10.3200/JOEE.38.4.3-13

MANOLI, Constantinos C., Bruce JOHNSON, Andreas C. HADJICHAMBIS, Demetra PARASKEVA-HADJICHAMBI, Yiannis GEORGIOU and Hara IOANNOU. 2014. Evaluating the impact of the Earthkeepers earth education program on children’s ecological understandings, values and attitudes, and behaviour in Cyprus. Studies in Educational Evaluation, 41: 29-37. https://doi.org/10.1016/j.stueduc.2013.09.008

MCKENZIE-MOHR, Doug, P. Wesley SCHULTZ, Nancy R. LEE and Philip A.KOTLER. 2012. Social Marketing to Protect the Environment : What Works. Thousand Oaks, CA: Sage. https://doi.org/10.4135/9781483349466

MEINHOLD, Jana L. 2005. Adolescent Environmental Behaviors: Can Knowledge, Attitudes, and Self-Efficacy Make a Difference? Environment and Behavior, 37, 511–532. https://doi.org/10.1177/0013916504269665

MILFONT, Taciano and John DUCKITT. 2004. The structure of environmental attitudes: A first- and second-order confirmatory factor analysis. Journal of Environmental Psychology, 24: 289–303. https://doi.org/10.1016/j.jenvp.2004.09.001

MUNOZ, Francois, Franz X. BOGNER, Pierre CLEMENT and Graca CARVALHO. 2009. Teachers’ conceptions of nature and environment in 16 countries. Journal of Environmental Psychology, 29: 407–413. https://doi.org/10.1016/j.jenvp.2009.05.007

NOLAN, Jessica M. 2010. “An Inconvenient Truth” Increases Knowledge, Concern, and Willingness to Reduce Greenhouse Gases. Environment and Behavior, 42(5), 643-658. https://doi.org/10.1177/0013916509357696

POOLEY, Julie A. and Moira O’CONNOR. 2000. Environmental Education and Attitudes: Emotions and Beliefs are What is Needed. Environment and Behavior, 32(5), 711–723. https://doi.org/10.1177/0013916500325007

ROCZEN, Nina, Florian. G. KAISER, Franz X. BOGNER and Mark WILSON. 2014. A competence model for environmental education. Environment and Behavior, 46: 972-992. https://doi.org/10.1177/0013916513492416

STERN, Paul C. 2000. Toward a coherent theory of environmentally significant behavior. Journal of Social Issues, 56(3): 407–424. https://doi.org/10.1111/0022-4537.00175

STERN, Paul C., Thomas DIETZ, Abel TROY, Gregory. A.GUAGNANO and Linda KALOF. (1999). A Value-Belief-Norm Theory of Support for Social Movements: The Case of Environmentalism. Human Ecology Review, 6 (6), 81-97.

THAPA, Brijesh. 1999. Environmentalism: The Relation of Environmental Attitudes and Environmentally Responsible Behaviors Among Undergraduate Students. Bulletin of Science, Technology & Society, 19(5), 426–438. https://doi.org/10.1177/027046769901900512

VAN MATRE, Steve. 1990. Earth education: A new beginning. Greenville, WV: The Institute for Earth Education.

VAN MATRE, Steve and Bruce JOHNSON. 1988. Earthkeepers: Four keys for helping young people live in harmony with the earth. Greenville, WV: The Institute for Earth Education.

VAN MATRE, Steve and Bruce JOHNSON. 1997. Sunship III: Perception and Choice for the Journey Ahead. Greenville, WV: The Institute for Earth Education.

VAN PETEGEM, Peter and An BLIECK. 2006. The environmental worldview of children: a cross-cultural perspective. Environmental Education Research, 12(5): 625-635. https://doi.org/10.1080/13504620601053662

WISEMAN, Michael and Franz. X. BOGNER. 2003. A higher-order model of ecological values and its relationship to personality. Personality and Individual Differences, 34: 783–794. https://doi.org/10.1016/S0191-8869(02)00071-5

WOHLERS, Lars and Bruce JOHNSON. 2003. A programmatic approach: Purposeful experiences. Zeitschrift Für Erlebnispädagogik, 23(5/6): 14-22.