MLA

Saarinen, Eero, 1910-1961. Structural sepias. Box 283 | Box 284. undated. https://collections.library.yale.edu/catalog/32203173.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 283 | Box 284"])(undated)[Structural sepias]. https://collections.library.yale.edu/catalog/32203173.