1. Brundtlands Commission,World Commission on Environment and Development (WCED) (1987). Our Common Future. Oxford, United Kingdom: Oxford University Press.
2. United Nations Conference on Environment and Development (UNCED) (1992). RIO DECLARATION ON ENVIRONMENT AND DEVELOPMENT, Paris, France: United Nations General Assembly.
3. Carson, R. (1965). The sense of wonder. NewYork, USA: Harper Collins.
4. Lucus, A. (1972). Environment and environmental education: Conceptual issues and curriculum interpretations.Columbus, Ohio, United States: Unpublished doctoral dissertation.The Ohio State University.
5. Robottom, I., & Hart, P. (1993). Research in environmental education:Engaging the dabate. Geelong,Victoria, Australia: Deakin University Press.