MLA

Kilpatrick, Jack Frederick (1915-1967). Envelope with unidentified text and note with Kilpatrick children's names in Cherokee. Box 14, folder 1236. circa 1962. https://collections.library.yale.edu/catalog/15530870.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 14, folder 1236"])(circa 1962)[Envelope with unidentified text and note with Kilpatrick children's names in Cherokee]. https://collections.library.yale.edu/catalog/15530870.