MLA

Simpson, Randolph Linsly, 1927-1992. Studio unknown Mounted recto, "Camp of 27th U.S. Colored Infantry." Stereograph, pink card. Box 12, folder 557. circa 1863. https://collections.library.yale.edu/catalog/2005529.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 12, folder 557"])(circa 1863)[Studio unknown Mounted recto, "Camp of 27th U.S. Colored Infantry." Stereograph, pink card]. https://collections.library.yale.edu/catalog/2005529.