MLA

Simpson, Randolph Linsly, 1927-1992. Doolittle; Montrose, PA Three quarter length portrait; black woman seated with white baby on lap. Cabinet photograph.. Box 9, folder 184. circa 1890. https://collections.library.yale.edu/catalog/2002236.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 9, folder 184"])(circa 1890)[Doolittle; Montrose, PA Three quarter length portrait; black woman seated with white baby on lap. Cabinet photograph.]. https://collections.library.yale.edu/catalog/2002236.