MLA

Simpson, Randolph Linsly, 1927-1992. Studio unknown Exterior view, full length portrait, man in suit wearing derby, seated outdoors. Tintype, paper cased, sixth plate. Box 7, folder 129. circa 1885. https://collections.library.yale.edu/catalog/2002185.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 7, folder 129"])(circa 1885)[Studio unknown Exterior view, full length portrait, man in suit wearing derby, seated outdoors. Tintype, paper cased, sixth plate]. https://collections.library.yale.edu/catalog/2002185.