MLA
Co., E. C. Kropp. Williams Hall, Men's Dormitory, Virginia State College for Negroes, Petersburg, Virginia. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/436tx95x9h-cor.
APA, 6th edition
Co., E. C. K. Williams Hall, men's dormitory, Virginia State College for Negroes, Petersburg, Virginia (Box 70) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/436tx95x9h-cor.
Chicago
Co., E. C. Kropp. “Williams Hall, Men's Dormitory, Virginia State College for Negroes, Petersburg, Virginia.” 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/436tx95x9h-cor.