MLA

Simpson, Randolph Linsly, 1927-1992. B.W. Kilburn, Littleton, NH "6946. Morning Start in the Cotton Field." Stereograph, pink card. Box 13, folder 639. circa 1895. https://collections.library.yale.edu/catalog/10257580.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 13, folder 639"])(circa 1895)[B.W. Kilburn, Littleton, NH "6946. Morning Start in the Cotton Field." Stereograph, pink card]. https://collections.library.yale.edu/catalog/10257580.