MLA
Ellis Post Card Co. (Arlington, Wash.). Hop harvesting, Central Washington : African American workers on a truck. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/556931zcw2-cor.
APA, 6th edition
Ellis Post Card Co. (Arlington, Wash.). (unknown)[Hop harvesting, Central Washington : African American workers on a truck]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/556931zcw2-cor.
Chicago
Ellis Post Card Co. (Arlington, Wash.), Hop harvesting, Central Washington : African American workers on a truck, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/556931zcw2-cor.