MLA

Kilpatrick, Jack Frederick (1915-1967). Prayer. Box 11, folder 1019. 1910 October 2. https://collections.library.yale.edu/catalog/15493825.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 11, folder 1019"])(1910 October 2)[Prayer]. https://collections.library.yale.edu/catalog/15493825.