MLA
Fellan, J. M. Letter from J. M. Fellan (near Manassas, Virginia) to Elbert Riddick[?] (Photocopy). 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 10, Folder 1. https://digital.library.emory.edu/purl/56341ns2vt-cor.
APA, 6th edition
Fellan, J. M. (1861). Letter from J. M. Fellan (near Manassas, Virginia) to Elbert Riddick[?] (photocopy) (Box 10, Folder 1) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/56341ns2vt-cor.
Chicago
Fellan, J. M. “Letter from J. M. Fellan (near Manassas, Virginia) to Elbert Riddick[?] (Photocopy).” Letters (correspondence). Civil War Collection, 1861. Box 10, Folder 1. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/56341ns2vt-cor.