APA (7. basım) Alıntı

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

Chicago Style (17. basım) Atıf

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

MLA (8th ed.) Atıf

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