MLA

Van Thal, Herbert, 1904-1983. "C" general. Box 1, folder 22. 1935-72. https://collections.library.yale.edu/catalog/16545926.

APA, 6th edition

Van Thal, Herbert, 1904-1983. (["Box 1, folder 22"])(1935-72)["C" general]. https://collections.library.yale.edu/catalog/16545926.