Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (8a ed.)

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