Hungerford, H. R. (1980). Strategies for developing an environmental education curriculum: A discussion guide for Unesco training workshops on environmental education. Unesco, Regional Office for Education in Asia and Oceania.
Citace podle Chicago (17th ed.)Hungerford, Harold R. Strategies for Developing an Environmental Education Curriculum: A Discussion Guide for Unesco Training Workshops on Environmental Education. Bangkok: Unesco, Regional Office for Education in Asia and Oceania, 1980.
Citace podle MLA (9th ed.)Hungerford, Harold R. Strategies for Developing an Environmental Education Curriculum: A Discussion Guide for Unesco Training Workshops on Environmental Education. Unesco, Regional Office for Education in Asia and Oceania, 1980.
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