Não informado. (1994). International Journal of Sustainable Development and World Ecology. Parthenon Publishing.
Chicago-referens (17:e uppl.)Não informado. International Journal of Sustainable Development and World Ecology. Lancs, Inglaterra: Parthenon Publishing, 1994.
MLA-referens (8:e uppl.)Não informado. International Journal of Sustainable Development and World Ecology. Parthenon Publishing, 1994.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.