Cita APA (7a ed.)

Eckholm, E. P., & Worldwatch Institute. (1976). Losing ground. Norton.

Cita Chicago Style (17a ed.)

Eckholm, Erik P., y Worldwatch Institute. Losing Ground. New York: Norton, 1976.

Cita MLA (8a ed.)

Eckholm, Erik P., y Worldwatch Institute. Losing Ground. Norton, 1976.