APA (7e ed.) Bronvermelding

Hapgood, C. H. (1970). The path of the pole (2nd ed.). Chilton.

Chicago (17e ed.) Bronvermelding

Hapgood, Charles H. The Path of the Pole. 2nd ed. Philadelphia: Chilton, 1970.

MLA (9e ed.) Bronvermelding

Hapgood, Charles H. The Path of the Pole. 2nd ed. Chilton, 1970.