Gibbs, J. M. (1905). History of the First battalion Pennsylvania six months volunteers and the 187th regiment Pennsylvania volunteer infantry: Six months and three years service, civil war, 1863-1865. [Harrisburg, Pa.: Central printing and publishing house].

Gibbs, James M. History of the First Battalion Pennsylvania Six Months Volunteers and the 187th Regiment Pennsylvania Volunteer Infantry: Six Months and Three Years Service, Civil War, 1863-1865. [Harrisburg, Pa.: Central printing and publishing house], 1905.

Gibbs, James M. History of the First Battalion Pennsylvania Six Months Volunteers and the 187th Regiment Pennsylvania Volunteer Infantry: Six Months and Three Years Service, Civil War, 1863-1865. [Harrisburg, Pa.: Central printing and publishing house], 1905.