Tolong jelaskan mengenai Bacaan lebih lanjut dari Clement Vallandigham

Hubert C. Hubbart, "'Pro-Southern' Influences in the Free West, 1840-1865," Mississippi Valley Historical Review (1933), 20#1 pp. 45–62 in JSTOR

Edward C. Kirkland, The Peacemakers of 1864 (1927)

Klement, Frank L. The Limits of Dissent: Clement L. Vallandigham and the Civil War (1998), a standard scholarly biography

John Nicolay and John Hay. "Abraham Lincoln: A History. Vallandigham" The Century May 1889 pp 127-37 online at MOA

James G. Randall, Constitutional Problems under Lincoln (1926)