Filho, W. L., Murphy, Z., & O'Loan, K. (1996). A sourcebook for environmental education: : a practical review based on the belgrade charter. New York: The Parthenon Publishing Group.
Παραπομπή Chicago StyleFilho, W. Leal, Z. Murphy, and K. O'Loan. A Sourcebook for Environmental Education: : A Practical Review Based On the Belgrade Charter. New York: The Parthenon Publishing Group, 1996.
Παραπομπή MLAFilho, W. Leal, Z. Murphy, and K. O'Loan. A Sourcebook for Environmental Education: : A Practical Review Based On the Belgrade Charter. New York: The Parthenon Publishing Group, 1996.
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