APA-viite

Sprout, H., & Spourt, M. (1971). Toward a politics of the planet earth.

Chicago-tyylinen lähdeviittaus

Sprout, Harold, ja Margaret Spourt. Toward a Politics of the Planet Earth. New York, 1971.

MLA-viite

Sprout, Harold, ja Margaret Spourt. Toward a Politics of the Planet Earth. 1971.