For more information, see NRA's amicus brief in U.S. v. Emerson and a bibliography of more than 125 published books, law reviews, and essays on the Second Amendmentas an individual right.
Also, see Madison and the Bill of Rights, Virginia's Great Dissenters, Our Second Amendment: The Original Perspective, The Bill of Rights and the States, America's Founding Fathers on the Right to Keep and Bear Arms, A Liberal Democrat's lament, "Showdown!" at linguafranca.com, and Lost Battles, Lost Rights.
Other resources include www.gunscholar.org.