APA (7e ed.) Bronvermelding

Barnard, J. D. (1962). The macmillan science life series book 4 (rev.ed.). Macmillan.

Chicago (17e ed.) Bronvermelding

Barnard, John Darrell. The Macmillan Science Life Series Book 4. rev.ed. New York: Macmillan, 1962.

MLA (9e ed.) Bronvermelding

Barnard, John Darrell. The Macmillan Science Life Series Book 4. rev.ed. Macmillan, 1962.