MLA
Gardner, H. F. Theodore West, an Advertising and Marketing Consultant, Sitting behind a Desk. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 71. https://digital.library.emory.edu/purl/064tht76kd-cor.
APA, 6th edition
Gardner, H. F. Theodore West, an advertising and marketing consultant, sitting behind a desk (Box 71) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/064tht76kd-cor.
Chicago
Gardner, H. F. “Theodore West, an Advertising and Marketing Consultant, Sitting behind a Desk.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 71. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/064tht76kd-cor.