Hardin, M. D. 1. (1890). History of the Twelfth regiment, Pennsylvania reserve volunteer corps (41st regiment of the line): From its muster into the United States service, August 10th, 1861, to its muster out, June 11th, 1864, together with biographical sketches of officers and men and a complete muster-out roll. New York: Pub. by the author.

Hardin, M. D. 1837-1923. History of the Twelfth Regiment, Pennsylvania Reserve Volunteer Corps (41st Regiment of the Line): From Its Muster Into the United States Service, August 10th, 1861, to Its Muster Out, June 11th, 1864, Together With Biographical Sketches of Officers and Men and a Complete Muster-out Roll. New York: Pub. by the author, 1890.

Hardin, M. D. 1837-1923. History of the Twelfth Regiment, Pennsylvania Reserve Volunteer Corps (41st Regiment of the Line): From Its Muster Into the United States Service, August 10th, 1861, to Its Muster Out, June 11th, 1864, Together With Biographical Sketches of Officers and Men and a Complete Muster-out Roll. New York: Pub. by the author, 1890.