MLA

Saarinen, Eero, 1910-1961. "The Maturing Modern," Time. Box 56, folder 130. 1956. https://collections.library.yale.edu/catalog/10017468.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 56, folder 130"])(1956)["The Maturing Modern," Time]. https://collections.library.yale.edu/catalog/10017468.