Cita APA

Douglas, W. O. n. 1. (1960). American challenged. New York, New York: Avon Books.

Citación estilo Chicago

Douglas, William Orville n. 1898. American Challenged. New York, New York: Avon Books, 1960.

Cita MLA

Douglas, William Orville n. 1898. American Challenged. New York, New York: Avon Books, 1960.