Cite

"Preparatory work," notes, autograph manuscript

MLA

Knott, Frederick (1916-2002). "Preparatory work," notes, autograph manuscript. Box 3, folder 21. undated. https://collections.library.yale.edu/catalog/17329950.

APA, 6th edition

Knott, Frederick (1916-2002). (["Box 3, folder 21"])(undated)["Preparatory work," notes, autograph manuscript]. https://collections.library.yale.edu/catalog/17329950.