Goldsby, R. A., & Bell, C. R. (1976). Biology. Harper & Row.
Lua i Stíl Chicago (17ú heag.)Goldsby, Richard A., agus C. Ritchie Bell. Biology. New York: Harper & Row, 1976.
Lua MLA (8ú heag.)Goldsby, Richard A., agus C. Ritchie Bell. Biology. Harper & Row, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.