MLA
Humphrey, W. A. Letter from W. A.[?] Humphrey to Joan Browning in the Dougherty County [Georgia] Jail during the Albany Movement. Pencil on Ruled Note Paper - December 16, 1961. Includes Typed Transcript. 1961. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 1, Folder 2. https://digital.library.emory.edu/purl/4579s4mwms-cor.
APA, 6th edition
Humphrey, W. A. (1961). Letter from W. A.[?] Humphrey to Joan Browning in the Dougherty County [Georgia] jail during the Albany Movement. Pencil on ruled note paper - December 16, 1961. Includes typed transcript (Box 1, Folder 2) [Correspondence]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/4579s4mwms-cor.
Chicago
Humphrey, W. A.[?]. “Letter from W. A.[?] Humphrey to Joan Browning in the Dougherty County [Georgia] Jail during the Albany Movement. Pencil on Ruled Note Paper - December 16, 1961. Includes Typed Transcript.” Correspondence. Joan C. Browning Papers, 1961-2006, 1961. Box 1, Folder 2. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/4579s4mwms-cor.