Ardrey, R. (1970). The social contract: A personal enquiry into the evolutionary sources of order and disorder. Collins.
Chicago (17e ed.) BronvermeldingArdrey, Robert. The Social Contract: A Personal Enquiry into the Evolutionary Sources of Order and Disorder. London: Collins, 1970.
MLA (9e ed.) BronvermeldingArdrey, Robert. The Social Contract: A Personal Enquiry into the Evolutionary Sources of Order and Disorder. Collins, 1970.
Let op: Deze citaties zijn niet altijd 100% accuraat.