MLA

Saarinen, Eero, 1910-1961. Sketches. Box 463, folder 1314. undated. https://collections.library.yale.edu/catalog/10011397.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 463, folder 1314"])(undated)[Sketches]. https://collections.library.yale.edu/catalog/10011397.