APA (7e ed.) Bronvermelding

Drury, G. H. (1976). The face of the earth. Penguin Books.

Chicago (17e ed.) Bronvermelding

Drury, George Harry. The Face of the Earth. Harmondsworth, Middlesex: Penguin Books, 1976.

MLA (9e ed.) Bronvermelding

Drury, George Harry. The Face of the Earth. Penguin Books, 1976.