APA (7th ed.) Citation

Lewis, Campbell, & Steele. (2007). Gun digest book of assault weapons (7th ed.). Krause Publications.

Chicago Style (17th ed.) Citation

Lewis, Campbell, and Steele. Gun Digest Book of Assault Weapons. 7th ed. Iola, WI: Krause Publications, 2007.

MLA (8th ed.) Citation

Lewis, et al. Gun Digest Book of Assault Weapons. 7th ed. Krause Publications, 2007.