Παραπομπή σε μορφή APA (7η εκδ.)

Ardrey, R., & Ardrey, B. (1970). The social contract: A personal inquiry into the evolutionary sources of order and disorder. A Delta Book.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Ardrey, Robert, και Berdine Ardrey. The Social Contract: A Personal Inquiry into the Evolutionary Sources of Order and Disorder. New York: A Delta Book, 1970.

Παραπομπή σε μορφή MLA (9th εκδ.)

Ardrey, Robert, και Berdine Ardrey. The Social Contract: A Personal Inquiry into the Evolutionary Sources of Order and Disorder. A Delta Book, 1970.