MLA
Halvey, Robert S. Line of Women in Dresses Standing on One Foot with a Woman Instructing Them, and Another Playing the Piano. 1956. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 9. https://digital.library.emory.edu/purl/310jsxkssz-cor.
APA, 6th edition
Halvey, R. S. (1956). Line of women in dresses standing on one foot with a woman instructing them, and another playing the piano (Box 9) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/310jsxkssz-cor.
Chicago
Halvey, Robert S. “Line of Women in Dresses Standing on One Foot with a Woman Instructing Them, and Another Playing the Piano.” Black-and-white photographs. Robert Langmuir African American Photograph Collection, 1956. Box 9. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/310jsxkssz-cor.