Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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