MLA

Saarinen, Eero, 1910-1961. Exteriors. Box 215, folder 684. 1959; undated. https://collections.library.yale.edu/catalog/10017556.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 215, folder 684"])(1959; undated)[Exteriors]. https://collections.library.yale.edu/catalog/10017556.