Gould, J. L., & Keeton, W. T. (1996). Biological science (6th ed.). W.W. Norton.
Lua i Stíl Chicago (17ú heag.)Gould, James L., agus William T. Keeton. Biological Science. 6th ed. New York: W.W. Norton, 1996.
Lua MLA (9ú heag.)Gould, James L., agus William T. Keeton. Biological Science. 6th ed. W.W. Norton, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.