APA

Carrel A., . (1939). Man the unknown. New York: Harper & Brothers.

Chicago

Carrel Alexis, . 1939. Man the unknown. New York: Harper & Brothers.

Harvard

Carrel A., . (1939). Man the unknown. New York: Harper & Brothers.

MLA

Carrel Alexis, . Man the unknown. New York: Harper & Brothers. 1939.