MLA

Simpson, Randolph Linsly, 1927-1992. Unknown photographer Double portrait: black caregiver seated on left with white child seated on right. Black woman holds small ball. Sixth plate, daguerreotype, tinted. Box 2, folder 17. circa 1855. https://collections.library.yale.edu/catalog/2002078.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 2, folder 17"])(circa 1855)[Unknown photographer Double portrait: black caregiver seated on left with white child seated on right. Black woman holds small ball. Sixth plate, daguerreotype, tinted]. https://collections.library.yale.edu/catalog/2002078.