See L. P. Graf and R. W. Haskins, ed., The Papers of Andrew Johnson (16 vol., 1967–2000); biographies by R. W. Winston (1928, repr. 1969) and H. L. Trefousse (1997); D. M. Dewitt, The Impeachment and Trial of Andrew Johnson (1903, repr. 1967); H. K. Beale, The Critical Year (1930, new introd. 1958); M. Lomask, Andrew Johnson: President on Trial (1960, repr. 1973); E. L. McKitrick, Andrew Johnson and Reconstruction (1960) and Andrew Johnson, A Profile (1969, repr. 1972); M. L. Benedict, The Impeachment and Trial of Andrew Johnson (1973); H. L. Trefousse, Impeachment of a President (1975, repr. 1999); A. Castel, The Presidency of Andrew Johnson (1979).
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