MLA

Saarinen, Eero, 1910-1961. Exteriors; dedication. Box 66, folder 107. undated. https://collections.library.yale.edu/catalog/10017398.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 66, folder 107"])(undated)[Exteriors; dedication]. https://collections.library.yale.edu/catalog/10017398.