APA (7th ed.) Citation

Walter. (2005). Machine guns of two world wars. Greenhill Books.

Chicago Style (17th ed.) Citation

Walter. Machine Guns of Two World Wars. London: Greenhill Books, 2005.

MLA (8th ed.) Citation

Walter. Machine Guns of Two World Wars. Greenhill Books, 2005.

Warning: These citations may not always be 100% accurate.