MLA

Simpson, Randolph Linsly, 1927-1992. Unknown photographer Three quarter portrait, seated young black lady, summer dress. Ambrotype, sixth plate. Box 3, folder 33. circa 1860. https://collections.library.yale.edu/catalog/2002053.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 3, folder 33"])(circa 1860)[Unknown photographer Three quarter portrait, seated young black lady, summer dress. Ambrotype, sixth plate]. https://collections.library.yale.edu/catalog/2002053.