MLA

Kilpatrick, Jack Frederick (1915-1967). Echota Sunday School note. Box 1, folder 73. 1928 October 28. https://collections.library.yale.edu/catalog/15492074.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 1, folder 73"])(1928 October 28)[Echota Sunday School note]. https://collections.library.yale.edu/catalog/15492074.