MLA

Simpson, Randolph Linsly, 1927-1992. Studio unknown Full length triple portrait; man seated in Pullman car porter's uniform, hat in hand; two ladies standing, flank him on either side. Tintype, half plate. Box 8, folder 147. circa 1885. https://collections.library.yale.edu/catalog/2002190.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 8, folder 147"])(circa 1885)[Studio unknown Full length triple portrait; man seated in Pullman car porter's uniform, hat in hand; two ladies standing, flank him on either side. Tintype, half plate]. https://collections.library.yale.edu/catalog/2002190.