MLA

Saarinen, Eero, 1910-1961. Models. Box 411, folder 1154. undated. https://collections.library.yale.edu/catalog/10017883.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 411, folder 1154"])(undated)[Models]. https://collections.library.yale.edu/catalog/10017883.