MLA

Saarinen, Eero, 1910-1961. Negatives. Box 154, folder 442. undated. https://collections.library.yale.edu/catalog/10020550.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 154, folder 442"])(undated)[Negatives]. https://collections.library.yale.edu/catalog/10020550.