MLA

Simpson, Randolph Linsly, 1927-1992. Carl Nilsson, Norrköping, Hörnet af Drottning och Trädgådsgatorna (Sweden?) Full length double portrait, two standing men, tuxedos; each with a cigar in right hand, with brick wall prop. Carte de visite. Box 11, folder 374. circa 1880. https://collections.library.yale.edu/catalog/2003978.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 11, folder 374"])(circa 1880)[Carl Nilsson, Norrköping, Hörnet af Drottning och Trädgådsgatorna (Sweden?) Full length double portrait, two standing men, tuxedos; each with a cigar in right hand, with brick wall prop. Carte de visite]. https://collections.library.yale.edu/catalog/2003978.