Curtis, H., & Barnes, N. S. (1994). Invitation to Biology (5th.ed.). Worth.
Lua i Stíl Chicago (17ú heag.)Curtis, Helena, agus N. Sue Barnes. Invitation to Biology. 5th.ed. New York: Worth, 1994.
Lua MLA (9ú heag.)Curtis, Helena, agus N. Sue Barnes. Invitation to Biology. 5th.ed. Worth, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.