Cita APA (7th ed.)

Stefferud, A., & Briggs, S. (1956). The wonders of seeds. Harcourt, Brace and Company.

Cita Chicago (17th ed.)

Stefferud, Alfred, i Shirley Briggs. The Wonders of Seeds. New York: Harcourt, Brace and Company, 1956.

Cita MLA (9th ed.)

Stefferud, Alfred, i Shirley Briggs. The Wonders of Seeds. Harcourt, Brace and Company, 1956.