MLA

Saarinen, Eero, 1910-1961. Additional material. Box 673, folder 44. 1961-1962, 1967. https://collections.library.yale.edu/catalog/10015127.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 673, folder 44"])(1961-1962, 1967)[Additional material]. https://collections.library.yale.edu/catalog/10015127.