MLA
Brothers, Lane. Unidentified Speakers and Entertainers - People on Holding Various Country Flags. 1939. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 7, Folder 1. https://digital.library.emory.edu/purl/972p5hqckq-cor.
APA, 6th edition
Brothers, L. (1939). Unidentified Speakers and Entertainers - People on holding various country flags (Box 7, Folder 1) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/972p5hqckq-cor.
Chicago
Brothers, Lane. “Unidentified Speakers and Entertainers - People on Holding Various Country Flags.” Black-and-white photographs. Emory University Office of Alumni Publications Photographs, 1939. Box 7, Folder 1. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/972p5hqckq-cor.