APA (7th ed.) Citation

Lazenby, J. F. (2012). The Spartan Army (1. publ. in Great Britain.). Pen.

Chicago Style (17th ed.) Citation

Lazenby, John F. The Spartan Army. 1. publ. in Great Britain. Barnsley: Pen, 2012.

MLA (9th ed.) Citation

Lazenby, John F. The Spartan Army. 1. publ. in Great Britain. Pen, 2012.