MLA
Boston Massacre, March 5, 1770 : Soldiers in Uniforms Shotting at Each Other, with Crispus Attucks Being Shot in the Middle [Hand Colored]. 1913. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/733rv15dzm-cor.
APA, 6th edition
Boston Massacre, March 5, 1770 : Soldiers in uniforms shotting at each other, with Crispus Attucks being shot in the middle [hand colored] (Box 70). (1913). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/733rv15dzm-cor.
Chicago
“Boston Massacre, March 5, 1770 : Soldiers in Uniforms Shotting at Each Other, with Crispus Attucks Being Shot in the Middle [Hand Colored].” Postcards. Robert Langmuir African American Photograph Collection, 1913. Box 70. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/733rv15dzm-cor.