APA (7e ed.) Bronvermelding

Gordon, C. H. (1972). Before Columbus: Links between the old world and ancient America. Turnstone Press.

Chicago (17e ed.) Bronvermelding

Gordon, Cyrus H. Before Columbus: Links Between the Old World and Ancient America. London: Turnstone Press, 1972.

MLA (8e ed.) Bronvermelding

Gordon, Cyrus H. Before Columbus: Links Between the Old World and Ancient America. Turnstone Press, 1972.