Popenker, M., & Williams, A. G. (2008). Machine gun: The development of the machine gun from the nineteenth century to the present day. The Crowood Press.
Chicago Style (17th ed.) CitationPopenker, Maxim, and Anthony G. Williams. Machine Gun: The Development of the Machine Gun from the Nineteenth Century to the Present Day. Ramsbury: The Crowood Press, 2008.
MLA (9th ed.) CitationPopenker, Maxim, and Anthony G. Williams. Machine Gun: The Development of the Machine Gun from the Nineteenth Century to the Present Day. The Crowood Press, 2008.
Warning: These citations may not always be 100% accurate.