Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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