MLA

Saarinen, Eero, 1910-1961. Granada. Box 12, folder 195. undated. https://collections.library.yale.edu/catalog/10020365.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 12, folder 195"])(undated)[Granada]. https://collections.library.yale.edu/catalog/10020365.