Darwin, C. (2002). The complete works of Charles Darwin online.
Lua i Stíl Chicago (17ú heag.)Darwin, Charles. The Complete Works of Charles Darwin Online. Cambridge, 2002.
Lua MLA (8ú heag.)Darwin, Charles. The Complete Works of Charles Darwin Online. 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.