MLA

Kilpatrick, Jack Frederick (1915-1967). Keetoowah Society notes. Box 1, folder 61. 1939 October. https://collections.library.yale.edu/catalog/15492062.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 1, folder 61"])(1939 October)[Keetoowah Society notes]. https://collections.library.yale.edu/catalog/15492062.