MLA

Simpson, Randolph Linsly, 1927-1992. Eyer, Urbana, OH Lynch scene; crowd of white men gathered below black man hanging from tree. Cabinet photograph. Box 9, folder 218. circa 1890. https://collections.library.yale.edu/catalog/2002270.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 9, folder 218"])(circa 1890)[Eyer, Urbana, OH Lynch scene; crowd of white men gathered below black man hanging from tree. Cabinet photograph]. https://collections.library.yale.edu/catalog/2002270.