MLA
Mercer, Thomas J. Furlough Written by Captain Thomas J. Mercer for Thomas J. Wiley. Wiley Was a Private in the 42nd Georgia Infantry Regiment from Newton County, Georgia. 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 7, Folder 24. https://digital.library.emory.edu/purl/078gf1vjk6-cor.
APA, 6th edition
Mercer, T. J. (1862). Furlough written by Captain Thomas J. Mercer for Thomas J. Wiley. Wiley was a private in the 42nd Georgia Infantry Regiment from Newton County, Georgia (Box 7, Folder 24) [Military passes]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/078gf1vjk6-cor.
Chicago
Mercer, Thomas J. “Furlough Written by Captain Thomas J. Mercer for Thomas J. Wiley. Wiley Was a Private in the 42nd Georgia Infantry Regiment from Newton County, Georgia.” Military passes. Civil War Collection, 1862. Box 7, Folder 24. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/078gf1vjk6-cor.