MLA

Van Thal, Herbert, 1904-1983. "L" general. Box 1, folder 72. 1949-76. https://collections.library.yale.edu/catalog/16545976.

APA, 6th edition

Van Thal, Herbert, 1904-1983. (["Box 1, folder 72"])(1949-76)["L" general]. https://collections.library.yale.edu/catalog/16545976.