MLA

Saarinen, Eero, 1910-1961. Sketches and photostats of "Pedestal" furniture prototypes. Box 83, folder 155. undated. https://collections.library.yale.edu/catalog/10015805.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 83, folder 155"])(undated)[Sketches and photostats of "Pedestal" furniture prototypes]. https://collections.library.yale.edu/catalog/10015805.