Cita APA (7a ed.)

Downey, F. (1962). The guns at Gettysburg. Collier Books.

Cita Chicago Style (17a ed.)

Downey, Fairfax. The Guns at Gettysburg. New York: Collier Books, 1962.

Cita MLA (8a ed.)

Downey, Fairfax. The Guns at Gettysburg. Collier Books, 1962.