APA

Mayr E., . (1949). Systematics and the origin of species from the viewpoint of a zoologist. New York: Columbia University Press.

Chicago

Mayr Ernst, . 1949. Systematics and the origin of species from the viewpoint of a zoologist. New York: Columbia University Press.

Harvard

Mayr E., . (1949). Systematics and the origin of species from the viewpoint of a zoologist. New York: Columbia University Press.

MLA

Mayr Ernst, . Systematics and the origin of species from the viewpoint of a zoologist. New York: Columbia University Press. 1949.