1. Almeida, A. (2007). Educação Ambiental. A importância da dimensão ética. Lisboa: Livros Horizonte.
2. Bowers, C. A. (1993). Education cultural myths, and the ecological crisis. Toward deep changes. New York: State University of New York Press.
3. Callicott, J. B. (1989). In defense of the land ethic. Essays in environmental philosophy. New York: State University of New York Press.
4. Claire, H., & Holden, C. (2007). The challenge of teaching controversial issues: Principles and practice. In H. Claire & C. Holden (Eds.), The challenge of teaching controversial issues (pp. 1–14). Stoke on Trent: Trentham Books.
5. Corbett, J. (2006). Communicating nature. Washington: Island Press.