APA (7th ed.) Citation

Held, R. (1957). The age of firearms: A pictorial history. Harper.

Chicago Style (17th ed.) Citation

Held, Robert. The Age of Firearms: A Pictorial History. New York: Harper, 1957.

MLA (9th ed.) Citation

Held, Robert. The Age of Firearms: A Pictorial History. Harper, 1957.