Stefferud, A., & Briggs, S. (1956). The wonders of seeds. Harcourt, Brace and Company.
Lua i Stíl Chicago (17ú heag.)Stefferud, Alfred, agus Shirley Briggs. The Wonders of Seeds. New York: Harcourt, Brace and Company, 1956.
Lua MLA (9ú heag.)Stefferud, Alfred, agus Shirley Briggs. The Wonders of Seeds. Harcourt, Brace and Company, 1956.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.