MLA

Saarinen, Eero, 1910-1961. Exteriors. Box 495, folder 1346. undated. https://collections.library.yale.edu/catalog/10017308.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 495, folder 1346"])(undated)[Exteriors]. https://collections.library.yale.edu/catalog/10017308.