MLA

Simpson, Randolph Linsly, 1927-1992. Unknown photographer Half-length portrait, young boy. Cased tintype, ninth plate. Box 5, folder 73. circa 1870. https://collections.library.yale.edu/catalog/2002130.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 5, folder 73"])(circa 1870)[Unknown photographer Half-length portrait, young boy. Cased tintype, ninth plate]. https://collections.library.yale.edu/catalog/2002130.