MLA

Simpson, Randolph Linsly, 1927-1992. Studio unknown Three quarter portrait, young man seated with arm resting on chair. Tintype, sixth plate. Box 7, folder 86. circa 1880. https://collections.library.yale.edu/catalog/2002143.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 7, folder 86"])(circa 1880)[Studio unknown Three quarter portrait, young man seated with arm resting on chair. Tintype, sixth plate]. https://collections.library.yale.edu/catalog/2002143.