APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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