Keeton, W. T., & Bensadoun, P. D. (1969). Elements of biological science (First edition.). National Bookstore.
Lua i Stíl Chicago (17ú heag.)Keeton, William T., agus Paula DiSanto Bensadoun. Elements of Biological Science. First edition. Manila: National Bookstore, 1969.
Lua MLA (9ú heag.)Keeton, William T., agus Paula DiSanto Bensadoun. Elements of Biological Science. First edition. National Bookstore, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.