MLA

Saarinen, Eero, 1910-1961. Presentation boards. Box 58, folder 7. 1945. https://collections.library.yale.edu/catalog/10017440.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 58, folder 7"])(1945)[Presentation boards]. https://collections.library.yale.edu/catalog/10017440.