(1983). Glossary of environmental education terms. International Environmental Education Programme, Unesco-Unep.
Citazione stile Chigago Style (17a edizione)Glossary of Environmental Education Terms. [S.l.]: International Environmental Education Programme, Unesco-Unep, 1983.
Citatione MLA (9a ed.)Glossary of Environmental Education Terms. International Environmental Education Programme, Unesco-Unep, 1983.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.