(1991). New Perspective On Evolution. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)New Perspective On Evolution. John Wiley & Sons, 1991.
Lua MLA (8ú heag.)New Perspective On Evolution. John Wiley & Sons, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.