APA (7th ed.) Citation

Walter, J. (2005). Machine - guns of two world wars. Greenhill Books [u.a.].

Chicago Style (17th ed.) Citation

Walter, John. Machine - Guns of Two World Wars. London: Greenhill Books [u.a.], 2005.

MLA (9th ed.) Citation

Walter, John. Machine - Guns of Two World Wars. Greenhill Books [u.a.], 2005.