Eckholm, E. P. (1978). Disappearing species: The social challenge. Worldwatch Institute.
Chicagoスタイル(17版)引用形式Eckholm, Erik P. Disappearing Species: The Social Challenge. [Washington]: Worldwatch Institute, 1978.
MLA(8版)引用形式Eckholm, Erik P. Disappearing Species: The Social Challenge. Worldwatch Institute, 1978.
警告: この引用は必ずしも正確ではありません.