Varon, Elizabeth R. Andrew Johnson: Domestic Affairs. Charlottesville, Virginia: Miller Center of Public Affairs, University of Virginia. [April 14, 2018]. (原始内容存档于2021-05-22).
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Varon, Elizabeth R. Andrew Johnson: Domestic Affairs. Charlottesville, Virginia: Miller Center of Public Affairs, University of Virginia. [April 14, 2018]. (原始内容存档于2021-05-22).