MLA

Saarinen, Eero, 1910-1961. Molded shell chair. Box 83, folder 160. undated. https://collections.library.yale.edu/catalog/10015824.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 83, folder 160"])(undated)[Molded shell chair]. https://collections.library.yale.edu/catalog/10015824.