(en) Albert G. Chadwick, Soldiers' record of the town of St. Johnsbury, Vermont in the War of the Rebellion, 1861-5, Saint-Johnsbury, C.M. Stone & Co., (lire en ligne), p. 177
books.google.com
(en) Thaddeus Stevens, The Selected Papers of Thaddeus Stevens : January 1814-March 1865, Pittsburgh, University of Pittsburgh Press, (lire en ligne), p. 322
(en) James M. Scovel, « Thaddeus Stevens », Lippincott's Monthly Magazine, a Popular Journal of General Literature, Philadelphie, J.B. Lippincott Company, , p. 550 (lire en ligne)
(en) Alexander Tsesis, The Thirteenth Amendment and American Freedom : A Legal History, New York University Press, , 229 p. (ISBN0-8147-8276-0, lire en ligne), p. 41-43
(en) Beverly Wilson Palmer, Selected Papers of Thaddeus Stevens, Pittsburgh, University of Pittsburgh Press, (ISBN1-55553-078-8, lire en ligne), p. 219
(en) James A. Delle et Mary Ann Levine, « Excavations at the Thaddeus Stevens and Lydia Hamilton Smith Site, Lancaster, Pennsylvania: Archaeological Evidence for the Underground Railroad », Northeast Historical Archaeology, Buffalo, State University of New York College at Buffalo, vol. 33, no 1, (lire en ligne)
(en) William C. Harris, « The Hampton Roads Peace Conference: A Final Test of Lincoln's Presidential Leadership », Journal of the Abraham Lincoln Association, no 21, (lire en ligne)