APA

Cronin A. J., . (1941). The keys of the kingdon. New York: Bantam Books.

Chicago

Cronin Archibal Joseph, . 1941. The keys of the kingdon. New York: Bantam Books.

Harvard

Cronin A. J., . (1941). The keys of the kingdon. New York: Bantam Books.

MLA

Cronin Archibal Joseph, . The keys of the kingdon. New York: Bantam Books. 1941.