Citazione Stile APA (7a Edizione)

Sprout, H., & Sprout, M. (1965). The ecological perspective on human affairs with special reference to international politics. Princeton University.

Citazione stile Chigago Style (17a edizione)

Sprout, Harold, e Margaret Sprout. The Ecological Perspective on Human Affairs with Special Reference to International Politics. Princeton: Princeton University, 1965.

Citatione MLA (9a ed.)

Sprout, Harold, e Margaret Sprout. The Ecological Perspective on Human Affairs with Special Reference to International Politics. Princeton University, 1965.