Não informado. (1971). Environment information access. Environmental Information Center of Ecology Forum.
Chicago-Zitierstil (17. Ausg.)Não informado. Environment Information Access. New York: Environmental Information Center of Ecology Forum, 1971.
MLA-Zitierstil (8. Ausg.)Não informado. Environment Information Access. Environmental Information Center of Ecology Forum, 1971.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.