MLA

Wescott, Glenway, 1901-1987. White, Katharine. Box 109, folder 1702. 1965-66. https://collections.library.yale.edu/catalog/17065026.

APA, 6th edition

Wescott, Glenway, 1901-1987. (["Box 109, folder 1702"])(1965-66)[White, Katharine]. https://collections.library.yale.edu/catalog/17065026.