MLA

Stanford, Frank, 1949-. [Letter : Frank Stanford to Father Jerome]. Box 3 | Folder : Letter to Father Jerome. Slow Tracking. undated. https://collections.library.yale.edu/catalog/12130095.

APA, 6th edition

Stanford, Frank, 1949-. (["Box 3 | Folder : Letter to Father Jerome. Slow Tracking"])(undated)[[Letter : Frank Stanford to Father Jerome]]. https://collections.library.yale.edu/catalog/12130095.