MLA

Simpson, Randolph Linsly, 1927-1992. Studio unknown Bust length portrait; young man in bow tie. Gem photo tintype, sixteenth plate. Box 7, folder 125. circa 1890. https://collections.library.yale.edu/catalog/2002181.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 7, folder 125"])(circa 1890)[Studio unknown Bust length portrait; young man in bow tie. Gem photo tintype, sixteenth plate]. https://collections.library.yale.edu/catalog/2002181.