Não informado. (1972). Ecological Research Series. U.S. Environmental Protection Agency.
Style de citation Chicago (17e éd.)Não informado. Ecological Research Series. Washington: U.S. Environmental Protection Agency, 1972.
Style de citation MLA (8e éd.)Não informado. Ecological Research Series. U.S. Environmental Protection Agency, 1972.
Attention : ces citations peuvent ne pas être correctes à 100%.