APA (7e ed.) Bronvermelding

Cotter, A. C. (1947). Natural species: An essay in definition and classification. Weston College Press.

Chicago (17e ed.) Bronvermelding

Cotter, A. C. Natural Species: An Essay in Definition and Classification. Weston, Mass.: Weston College Press, 1947.

MLA (8e ed.) Bronvermelding

Cotter, A. C. Natural Species: An Essay in Definition and Classification. Weston College Press, 1947.