MLA

Simpson, Randolph Linsly, 1927-1992. Unknown photographer Half-length portrait, young boy wearing straw hat. Cased tintype, ninth plate. Box 5, folder 74. circa 1869. https://collections.library.yale.edu/catalog/2002131.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 5, folder 74"])(circa 1869)[Unknown photographer Half-length portrait, young boy wearing straw hat. Cased tintype, ninth plate]. https://collections.library.yale.edu/catalog/2002131.