MLA

Kilpatrick, Jack Frederick (1915-1967). Sycamore Church notes. Box 22, folder 1810. 1943 February 14. https://collections.library.yale.edu/catalog/15532614.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 22, folder 1810"])(1943 February 14)[Sycamore Church notes]. https://collections.library.yale.edu/catalog/15532614.