MLA

Saarinen, Eero, 1910-1961. Exteriors. Box 72, folder 115. undated. https://collections.library.yale.edu/catalog/10019073.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 72, folder 115"])(undated)[Exteriors]. https://collections.library.yale.edu/catalog/10019073.