MLA

Gregory, Alyse, 1882-1967. Wilkinson, Louis. Box 41, folder 729-730. 1936-45 Feb. https://collections.library.yale.edu/catalog/17072596.

APA, 6th edition

Gregory, Alyse, 1882-1967. (["Box 41, folder 729-730"])(1936-45 Feb)[Wilkinson, Louis]. https://collections.library.yale.edu/catalog/17072596.