MLA

Saarinen, Eero, 1910-1961. Sketches. Box 230, folder 769. 1955. https://collections.library.yale.edu/catalog/10017039.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 230, folder 769"])(1955)[Sketches]. https://collections.library.yale.edu/catalog/10017039.