Não informado. (1972). Ecological Research Series. U.S. Environmental Protection Agency.
Chicagoスタイル(17版)引用形式Não informado. Ecological Research Series. Washington: U.S. Environmental Protection Agency, 1972.
MLA(8版)引用形式Não informado. Ecological Research Series. U.S. Environmental Protection Agency, 1972.
警告: この引用は必ずしも正確ではありません.