MLA

Simpson, Randolph Linsly, 1927-1992. Unknown photographer Three quarter portrait, young Civil War soldier in kepi. Cased tintype, ninth plate. Box 5, folder 70. circa 1865. https://collections.library.yale.edu/catalog/2002127.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 5, folder 70"])(circa 1865)[Unknown photographer Three quarter portrait, young Civil War soldier in kepi. Cased tintype, ninth plate]. https://collections.library.yale.edu/catalog/2002127.