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Biographical Dictionary of the United States Congress
Dictionary of American Biography
The National Cyclopedia of American Biography
Newspaper articles 1849-1870
P. G. T. Beauregard to Pierre Soule, Dec. 8, 1863
Reineke, Jr., J. A. The Diplomatic Career of Pierre Soule M.A. Thesis, Tulane University, 1914
Reineke, Jr., J. A. The Diplomatic Career of Pierre Soule The Louisiana Historical Quarterly, April 1932
Freeman, Arthur. The Early Career of Pierre Soule The Louisiana Historical Quarterly, October 1942
Moore, J. Preston. Pierre Soule: Southern Expansionist and Promoter The Journal of Southern History, Vol. 21, No. 2. (May, 1955), pp. 203-223.