Cita APA (7a ed.)

Eckholm, E. P., & Fisher, W. B. (1978). Losing ground: Environmental stress and world food prospects (1. publ.). Pergamon Pr.

Cita Chicago Style (17a ed.)

Eckholm, Erik P., y W. B. Fisher. Losing Ground: Environmental Stress and World Food Prospects. 1. publ. Oxford [u.a.]: Pergamon Pr, 1978.

Cita MLA (9a ed.)

Eckholm, Erik P., y W. B. Fisher. Losing Ground: Environmental Stress and World Food Prospects. 1. publ. Pergamon Pr, 1978.