Não informado. (1972). Ecological Research Series. U.S. Environmental Protection Agency.
Chicago-Zitierstil (17. Ausg.)Não informado. Ecological Research Series. Washington: U.S. Environmental Protection Agency, 1972.
MLA-Zitierstil (8. Ausg.)Não informado. Ecological Research Series. U.S. Environmental Protection Agency, 1972.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.