MLA

Saarinen, Eero, 1910-1961. Exteriors. Box 64, folder 74. undated. https://collections.library.yale.edu/catalog/10016916.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 64, folder 74"])(undated)[Exteriors]. https://collections.library.yale.edu/catalog/10016916.