MLA

Saarinen, Eero, 1910-1961. Exteriors. Box 543, folder 1463. undated. https://collections.library.yale.edu/catalog/10017738.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 543, folder 1463"])(undated)[Exteriors]. https://collections.library.yale.edu/catalog/10017738.