MLA

Saarinen, Eero, 1910-1961. "Pedestal" chair prototype. Box 88, folder 166. undated. https://collections.library.yale.edu/catalog/10015802.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 88, folder 166"])(undated)["Pedestal" chair prototype]. https://collections.library.yale.edu/catalog/10015802.