MLA

Saarinen, Eero, 1910-1961. Additional material. Box 671, folder 5-7. 1949-1971. https://collections.library.yale.edu/catalog/10017445.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 671, folder 5-7"])(1949-1971)[Additional material]. https://collections.library.yale.edu/catalog/10017445.