MLA
[?], Stirling. Letter to Emory professor Dr. Bell Wiley regarding the provenance of the hand-tinted photograph of Confederate general Pierre Gustave Toutant-Beauregard. December 6, 1962. Civil War Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/634sj3tz0n-cor.
APA, 6th edition
[?], Stirling. (December 6, 1962)[Letter to Emory professor Dr. Bell Wiley regarding the provenance of the hand-tinted photograph of Confederate general Pierre Gustave Toutant-Beauregard]. Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/634sj3tz0n-cor.
Chicago
[?], Stirling, Letter to Emory professor Dr. Bell Wiley regarding the provenance of the hand-tinted photograph of Confederate general Pierre Gustave Toutant-Beauregard, December 6, 1962, Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/634sj3tz0n-cor.