APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Obourn, Ellsworth Scott. Exploring the World of Science. Princeton: D. Van Nostrand, 1963.

MLA (9th ed.) Citation

Obourn, Ellsworth Scott. Exploring the World of Science. D. Van Nostrand, 1963.