MLA

Van Thal, Herbert, 1904-1983. "F" general. Box 1, folder 40. 1952-74, n.d.. https://collections.library.yale.edu/catalog/16545944.

APA, 6th edition

Van Thal, Herbert, 1904-1983. (["Box 1, folder 40"])(1952-74, n.d.)["F" general]. https://collections.library.yale.edu/catalog/16545944.