Army Technical Manual (for M16 rifle) - TM9-1005-249-23P
Operator's Manual for Rifle, 5.56-Mm, M16 (1005-00-856-6885), Rifle, 5.56-Mm, M16a1 (1005-00-073-9421). Washington, DC: Headquarters, Dept. of the Army, 1988. Continually updated resource.
Rottman, Gordon L, and Martin Pegler. The M16. Botley, Oxford, UK: Osprey Publishing, 2011. Google Books. Web. 23 Oct 2012.
Kramer, Chuck. "VC Firepower - Can We Match It?" Popular Mechanics. June 1967: 97+. Web. Google Books. 22 Oct 12.