AUDESIRK, G. (1989). Biology Life On Earth. Macmillan.
Lua i Stíl Chicago (17ú heag.)AUDESIRK, Gerald. Biology Life On Earth. Macmillan, 1989.
Lua MLA (8ú heag.)AUDESIRK, Gerald. Biology Life On Earth. Macmillan, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.