Wainwright, J. (1968). Edge of extinction. Collins.
Lua i Stíl Chicago (17ú heag.)Wainwright, John. Edge of Extinction. London: Collins, 1968.
Lua MLA (8ú heag.)Wainwright, John. Edge of Extinction. Collins, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.