MLA

Saarinen, Eero, 1910-1961. Drawings. Box 164. undated. https://collections.library.yale.edu/catalog/32218646.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 164"])(undated)[Drawings]. https://collections.library.yale.edu/catalog/32218646.