APA

Gabrielson I. N., . (1941). Wildlife conservation. New York: Macmillan.

Chicago

Gabrielson Ira Noel, . 1941. Wildlife conservation. New York: Macmillan.

Harvard

Gabrielson I. N., . (1941). Wildlife conservation. New York: Macmillan.

MLA

Gabrielson Ira Noel, . Wildlife conservation. New York: Macmillan. 1941.