Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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