Joseph Story (1833). “Commentaries on the Constitution of the United States: With a Preliminary Review of the Constitutional History of the Colonies and States, Before the Adoption of the Constitution”, p.708
"The Right to Keep and Bear Arms - Report of the Subcommittee on the Constitution of the Committee on the Judiciary". Book by Dennis DeConcini and Orrin Hatch, February 1982.
"Aerosmith leader Joe Perry talks 'Sons of Guns,' classic firearms, defending the Second Amendment" By Hollie McKay, www.foxnews.com. September 21, 2012.