APA (7th ed.) Citation

O'Neill, R. (1984). An Illustrated guide to the modern US Army. Arco Pub..

Chicago Style (17th ed.) Citation

O'Neill, Richard. An Illustrated Guide to the Modern US Army. New York, N.Y.: Arco Pub., 1984.

MLA (9th ed.) Citation

O'Neill, Richard. An Illustrated Guide to the Modern US Army. Arco Pub., 1984.