APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (8. p.)

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