APA (7e ed.) Bronvermelding

Obourn, E. S. (1963). Discovering the world of science. D. Van Nostrand.

Chicago (17e ed.) Bronvermelding

Obourn, Ellsworth S. Discovering the World of Science. Princeton, NJ: D. Van Nostrand, 1963.

MLA (9e ed.) Bronvermelding

Obourn, Ellsworth S. Discovering the World of Science. D. Van Nostrand, 1963.