APA ציטוט

Eckholm, E. P. (1978). Disappearing species: The social challenge. Worldwatch Institute.

Chicago Style (17th ed.) Citation

Eckholm, Erik P. Disappearing Species: The Social Challenge. [Washington]: Worldwatch Institute, 1978.

ציטוט MLA

Eckholm, Erik P. Disappearing Species: The Social Challenge. Worldwatch Institute, 1978.