"J" general
MLA
Van Thal, Herbert, 1904-1983. "J" general. Box 1, folder 66. 1939, n.d.. https://collections.library.yale.edu/catalog/16545970.
APA, 6th edition
Van Thal, Herbert, 1904-1983. (["Box 1, folder 66"])(1939, n.d.)["J" general]. https://collections.library.yale.edu/catalog/16545970.