MLA

Simpson, Randolph Linsly, 1927-1992. B.W. Kilburn, Littleton, NH "457. Cotton Pickers, Florida, U.S.A." Copyright 1879. Stereograph, pink card. Box 13, folder 642. 1879. https://collections.library.yale.edu/catalog/32582613.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 13, folder 642"])(1879)[B.W. Kilburn, Littleton, NH "457. Cotton Pickers, Florida, U.S.A." Copyright 1879. Stereograph, pink card]. https://collections.library.yale.edu/catalog/32582613.