MLA

Van Thal, Herbert, 1904-1983. Gribble, George Dunning. Box 1, folder 49. 1925 Mar 3. https://collections.library.yale.edu/catalog/16545953.

APA, 6th edition

Van Thal, Herbert, 1904-1983. (["Box 1, folder 49"])(1925 Mar 3)[Gribble, George Dunning]. https://collections.library.yale.edu/catalog/16545953.