MLA

Simpson, Randolph Linsly, 1927-1992. J. Fenton's Gallery, Philadelphia Bust portrait, young man with moustache in hunting cap. Tintype, sixth plate. Box 7, folder 112. circa 1870. https://collections.library.yale.edu/catalog/2002168.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 7, folder 112"])(circa 1870)[J. Fenton's Gallery, Philadelphia Bust portrait, young man with moustache in hunting cap. Tintype, sixth plate]. https://collections.library.yale.edu/catalog/2002168.