MLA

Simpson, Randolph Linsly, 1927-1992. Underwood & Underwood, New York & Ottawa KS, Arlington, NJ "32, 13136 - The machine that separates lint cotton from the seed." Stereograph, grey card. Box 13, folder 678. undated. https://collections.library.yale.edu/catalog/32582697.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 13, folder 678"])(undated)[Underwood & Underwood, New York & Ottawa KS, Arlington, NJ "32, 13136 - The machine that separates lint cotton from the seed." Stereograph, grey card]. https://collections.library.yale.edu/catalog/32582697.