MLA

Simpson, Randolph Linsly, 1927-1992. L.A. Sawyer, Philadelphia Group portrait of 30 school children, various ages, plus teacher, arranged on steps outside brick building. Cabinet photograph. Box 9, folder 267. circa 1895. https://collections.library.yale.edu/catalog/2002319.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 9, folder 267"])(circa 1895)[L.A. Sawyer, Philadelphia Group portrait of 30 school children, various ages, plus teacher, arranged on steps outside brick building. Cabinet photograph]. https://collections.library.yale.edu/catalog/2002319.