MLA

Bachardy, Don, 1934-. Don Bachardy to Richard Isherwood. Box 1 | Folder 7. 1959 Sep 3. https://collections.library.yale.edu/catalog/16538011.

APA, 6th edition

Bachardy, Don, 1934-. (["Box 1 | Folder 7"])(1959 Sep 3)[Don Bachardy to Richard Isherwood]. https://collections.library.yale.edu/catalog/16538011.