MLA
St. Petersburg Post Card Association (St. Petersburg, Fl.). Southern products [hand colored]. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/515bcc2ftz-cor.
APA, 6th edition
St. Petersburg Post Card Association (St. Petersburg, Fl.). (unknown)[Southern products [hand colored]]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/515bcc2ftz-cor.
Chicago
St. Petersburg Post Card Association (St. Petersburg, Fl.), Southern products [hand colored], unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/515bcc2ftz-cor.