MLA

Simpson, Randolph Linsly, 1927-1992. C.M. Bell, Artist, Washington, D.C. Bust length portrait of Frederick Douglass, facing slightly right. Cabinet photograph. Box 9, folder 288. circa 1890. https://collections.library.yale.edu/catalog/2002347.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 9, folder 288"])(circa 1890)[C.M. Bell, Artist, Washington, D.C. Bust length portrait of Frederick Douglass, facing slightly right. Cabinet photograph]. https://collections.library.yale.edu/catalog/2002347.