MLA

Saarinen, Eero, 1910-1961. Chapel; Library. Box 200. undated. https://collections.library.yale.edu/catalog/10187434.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 200"])(undated)[Chapel; Library]. https://collections.library.yale.edu/catalog/10187434.