Audesirk, T., Audesirk, G., & Byers, B. E. (2006). Life on earth (4th ed.). Pearson Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Audesirk, Teresa, Gerald Audesirk, agus Bruce E. Byers. Life on Earth. 4th ed. Upper Saddle River, New Jersey: Pearson Prentice Hall, 2006.
Lua MLA (9ú heag.)Audesirk, Teresa, et al. Life on Earth. 4th ed. Pearson Prentice Hall, 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.