MLA

Van Thal, Herbert, 1904-1983. Rawlings, Margaret. Box 2, folder 104. 1941 Mar 1. https://collections.library.yale.edu/catalog/16546008.

APA, 6th edition

Van Thal, Herbert, 1904-1983. (["Box 2, folder 104"])(1941 Mar 1)[Rawlings, Margaret]. https://collections.library.yale.edu/catalog/16546008.