MLA

Simpson, Randolph Linsly, 1927-1992. Knowlton Bros., Northampton, MA Full length portrait of young man, standing with arm on newel with potted plant on top. Cabinet photograph. Box 9, folder 243. circa 1895. https://collections.library.yale.edu/catalog/2002295.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 9, folder 243"])(circa 1895)[Knowlton Bros., Northampton, MA Full length portrait of young man, standing with arm on newel with potted plant on top. Cabinet photograph]. https://collections.library.yale.edu/catalog/2002295.