MLA

Van Thal, Herbert, 1904-1983. Bentley, Phyllis. Box 1, folder 13. 1948-70. https://collections.library.yale.edu/catalog/16545917.

APA, 6th edition

Van Thal, Herbert, 1904-1983. (["Box 1, folder 13"])(1948-70)[Bentley, Phyllis]. https://collections.library.yale.edu/catalog/16545917.