MLA

Saarinen, Eero, 1910-1961. Knight, Carleton III. "Expressive Architecture: Eero Saarinen, 1910-1961," unpublished student essay. Box 56, folder 119. 1966. https://collections.library.yale.edu/catalog/10017806.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 56, folder 119"])(1966)[Knight, Carleton III. "Expressive Architecture: Eero Saarinen, 1910-1961," unpublished student essay]. https://collections.library.yale.edu/catalog/10017806.