- Ambrose Bierce Papers, 1872–1913 (2 linear ft.) are housed in the Department of Special Collections and University Archives at Stanford University Libraries.
- The Ambrose Bierce Papers, ca. 1894–1913 and the Collection of Ambrose Bierce Papers, 1875–1925, bulk 1890–1913 are housed at The Bancroft Library.
- Nickell, J. (1992). Ambrose Bierce is missing and other historical mysteries. Lexington, KY: University Press of Kentucky.
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