Mader, S. S. (1997). Inquiry into life (8th ed.). W.C. Brown.
Lua i Stíl Chicago (17ú heag.)Mader, Sylvia S. Inquiry into Life. 8th ed. Dubuque, IA: W.C. Brown, 1997.
Lua MLA (8ú heag.)Mader, Sylvia S. Inquiry into Life. 8th ed. W.C. Brown, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.