MLA
Am. Hist. Art Publ. Co. (New York, N.Y.). Thousand Hessian prisoners brought from Trenton to Philadelphia, Dec. 26, 1776, with an eagle carrying three flags with an olive branch. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/006sxksn3k-cor.
APA, 6th edition
Am. Hist. Art Publ. Co. (New York, N.Y.). (unknown)[Thousand Hessian prisoners brought from Trenton to Philadelphia, Dec. 26, 1776, with an eagle carrying three flags with an olive branch]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/006sxksn3k-cor.
Chicago
Am. Hist. Art Publ. Co. (New York, N.Y.), Thousand Hessian prisoners brought from Trenton to Philadelphia, Dec. 26, 1776, with an eagle carrying three flags with an olive branch, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/006sxksn3k-cor.