ROHAN BOOK CO. (2001). CHARLES DARWIN: WORLD GREAT SCIENTIST SERIES.
Lua i Stíl Chicago (17ú heag.)ROHAN BOOK CO. CHARLES DARWIN: WORLD GREAT SCIENTIST SERIES. 2001.
Lua MLA (9ú heag.)ROHAN BOOK CO. CHARLES DARWIN: WORLD GREAT SCIENTIST SERIES. 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.