MLA

Saarinen, Eero, 1910-1961. Models. Box 399, folder 1080. undated. https://collections.library.yale.edu/catalog/10017854.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 399, folder 1080"])(undated)[Models]. https://collections.library.yale.edu/catalog/10017854.