Eckholm, E. P. (1978). Disappearing species: The social challenge. Worldwatch Institute.
Chicago Style (17th ed.) CitationEckholm, Erik P. Disappearing Species: The Social Challenge. [Washington]: Worldwatch Institute, 1978.
MLA引文Eckholm, Erik P. Disappearing Species: The Social Challenge. Worldwatch Institute, 1978.
警告:這些引文格式不一定是100%准確.