MLA
Co., Majestic Pub. Two Men Standing on Either End of Abraham Lincoln's Horse Old Bob, in Front of a House with Two American Flags by the Steps, with Men Watching from the Sidewalk [Hand Colored]. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/627zkh18f2-cor.
APA, 6th edition
Co., M. P. Two men standing on either end of Abraham Lincoln's horse Old Bob, in front of a house with two American flags by the steps, with men watching from the sidewalk [hand colored] (Box 70) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/627zkh18f2-cor.
Chicago
Co., Majestic Pub. “Two Men Standing on Either End of Abraham Lincoln's Horse Old Bob, in Front of a House with Two American Flags by the Steps, with Men Watching from the Sidewalk [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/627zkh18f2-cor.