MLA
Company., Richmond Music. The Angels Sang That Happy Morn. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/327mpg4f86-cor.
APA, 6th edition
Company., R. M. The angels sang that happy morn (Box 70) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/327mpg4f86-cor.
Chicago
Company., Richmond Music. “The Angels Sang That Happy Morn.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 70. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/327mpg4f86-cor.