Lawton, J. H. (1995). Extinction rates. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Lawton, John H. Extinction Rates. Oxford: Oxford University Press, 1995.
Lua MLA (9ú heag.)Lawton, John H. Extinction Rates. Oxford University Press, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.