APA (7e ed.) Bronvermelding
Roberts, J., & Curtis, H. (1973). Civilization: Volume 1: the emergence of man in society. Communications research machines.
Chicago (17e ed.) Bronvermelding
Roberts, John, en Helena Curtis. Civilization: Volume 1: The Emergence of Man in Society. California: Communications research machines, 1973.
MLA (9e ed.) Bronvermelding
Roberts, John, en Helena Curtis. Civilization: Volume 1: The Emergence of Man in Society. Communications research machines, 1973.
Let op: Deze citaties zijn niet altijd 100% accuraat.