Agassiz, L. (1962). Essay on classification. Belknap Press of Harvard University Press.
Lua i Stíl Chicago (17ú heag.)Agassiz, Louis. Essay on Classification. Cambridge, Massachusetts: Belknap Press of Harvard University Press, 1962.
Lua MLA (9ú heag.)Agassiz, Louis. Essay on Classification. Belknap Press of Harvard University Press, 1962.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.