Cotter, A. C. (1947). Natural species: An essay in definition and classification. Weston College Press.
Lua i Stíl Chicago (17ú heag.)Cotter, A. C. Natural Species: An Essay in Definition and Classification. Weston, Mass.: Weston College Press, 1947.
Lua MLA (8ú heag.)Cotter, A. C. Natural Species: An Essay in Definition and Classification. Weston College Press, 1947.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.