MLA

Hagedorn, Hermann, 1882-1964. White, William Allen. Box 15. 1929-1937. https://collections.library.yale.edu/catalog/17420195.

APA, 6th edition

Hagedorn, Hermann, 1882-1964. (["Box 15"])(1929-1937)[White, William Allen]. https://collections.library.yale.edu/catalog/17420195.