MLA
Allgood, Susie W. Cake Walk at the Quarters, Down in Dixie : Man and Woman Dancing the Cakewalk While a Man Plays the Banjo, in Front of a Log Cabin Where Others Are Watching [Hand Colored]. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/201bk3j9pv-cor.
APA, 6th edition
Allgood, S. W. Cake walk at the quarters, Down in Dixie : Man and woman dancing the cakewalk while a man plays the banjo, in front of a log cabin where others are watching [hand colored] (Box 70) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/201bk3j9pv-cor.
Chicago
Allgood, Susie W. “Cake Walk at the Quarters, Down in Dixie : Man and Woman Dancing the Cakewalk While a Man Plays the Banjo, in Front of a Log Cabin Where Others Are Watching [Hand Colored].” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 70. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/201bk3j9pv-cor.