MLA

Federn, Ernst. Mental Hygiene As Applied to the Prevention of War. New York: State Hospitals Press, 1949.

APA

Federn, E. (1949). Mental hygiene as applied to the prevention of war. New York: State Hospitals Press.

Chicago

Federn, Ernst, Mental Hygiene As Applied to the Prevention of War. New York: State Hospitals Press, 1949.