MLA

Simpson, Randolph Linsly, 1927-1992. Anderson's Photographic Gallery, 61 Camp St., New Orleans, (LA) Cameo portrait of Ferdinand E. Erker; man posing in Union uniform. Carte de visite. Box 11, folder 426. circa 1864. https://collections.library.yale.edu/catalog/2003999.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 11, folder 426"])(circa 1864)[Anderson's Photographic Gallery, 61 Camp St., New Orleans, (LA) Cameo portrait of Ferdinand E. Erker; man posing in Union uniform. Carte de visite]. https://collections.library.yale.edu/catalog/2003999.