MLA

Saarinen, Eero, 1910-1961. Development models. Box 621, folder 1618. undated. https://collections.library.yale.edu/catalog/10017817.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 621, folder 1618"])(undated)[Development models]. https://collections.library.yale.edu/catalog/10017817.