Enger, E. D., & Kormelink, J. R. (1991). Concepts in biology (6th ed.). WCB.
Lua i Stíl Chicago (17ú heag.)Enger, Eldon D., agus J. Richard Kormelink. Concepts in Biology. 6th ed. Boulevard: WCB, 1991.
Lua MLA (9ú heag.)Enger, Eldon D., agus J. Richard Kormelink. Concepts in Biology. 6th ed. WCB, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.