MLA

Simpson, Randolph Linsly, 1927-1992. Underwood & Underwood, New York, Ottawa KS "12756 -- Cultivating onions in Alabama." Stereograph, grey card. Box 13, folder 666. undated. https://collections.library.yale.edu/catalog/32582664.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 13, folder 666"])(undated)[Underwood & Underwood, New York, Ottawa KS "12756 -- Cultivating onions in Alabama." Stereograph, grey card]. https://collections.library.yale.edu/catalog/32582664.