(1983). Glossary of environmental education terms. International Environmental Education Programme, Unesco-Unep.
Chicago-referens (17:e uppl.)Glossary of Environmental Education Terms. [S.l.]: International Environmental Education Programme, Unesco-Unep, 1983.
MLA-referens (9:e uppl.)Glossary of Environmental Education Terms. International Environmental Education Programme, Unesco-Unep, 1983.
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