MLA

Simpson, Randolph Linsly, 1927-1992. B.W. Kilburn, Littleton, N.H. "Waiting for your Team at the Cotton Gin, Florida"; men and boys stand on wagon and before gin. Stereograph. Box 13, folder 706. circa 1875. https://collections.library.yale.edu/catalog/32582751.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 13, folder 706"])(circa 1875)[B.W. Kilburn, Littleton, N.H. "Waiting for your Team at the Cotton Gin, Florida"; men and boys stand on wagon and before gin. Stereograph]. https://collections.library.yale.edu/catalog/32582751.