MLA

Lee, Richard C. (Richard Charles), 1916-2003. Personal files. Box 14. 1973-1974. https://collections.library.yale.edu/catalog/10019184.

APA, 6th edition

Lee, Richard C. (Richard Charles), 1916-2003. (["Box 14"])(1973-1974)[Personal files]. https://collections.library.yale.edu/catalog/10019184.