MLA

Saarinen, Eero, 1910-1961. Exterior. Box 82, folder 128. undated. https://collections.library.yale.edu/catalog/10017017.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 82, folder 128"])(undated)[Exterior]. https://collections.library.yale.edu/catalog/10017017.