MLA

Simpson, Randolph Linsly, 1927-1992. Studio unknown Full length portrait, seated man in suit, playing guitar, rustic set. Cap rests adjacent. Tintype, paper cased, half plate. Box 7, folder 134. circa 1885. https://collections.library.yale.edu/catalog/2002191.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 7, folder 134"])(circa 1885)[Studio unknown Full length portrait, seated man in suit, playing guitar, rustic set. Cap rests adjacent. Tintype, paper cased, half plate]. https://collections.library.yale.edu/catalog/2002191.