MLA

Van Thal, Herbert, 1904-1983. "B" general. Box 1, folder 7. 1936-79. https://collections.library.yale.edu/catalog/16545911.

APA, 6th edition

Van Thal, Herbert, 1904-1983. (["Box 1, folder 7"])(1936-79)["B" general]. https://collections.library.yale.edu/catalog/16545911.