MLA

Simpson, Randolph Linsly, 1927-1992. Underwood & Underwood, New York & Ottawa Kas; Arlington, NJ "15. 8083-Traveling granite surfacing machines operating by compressed air on large blocks." Stereograph, grey card. Box 13, folder 672. undated. https://collections.library.yale.edu/catalog/32582679.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 13, folder 672"])(undated)[Underwood & Underwood, New York & Ottawa Kas; Arlington, NJ "15. 8083-Traveling granite surfacing machines operating by compressed air on large blocks." Stereograph, grey card]. https://collections.library.yale.edu/catalog/32582679.