MLA

Kilpatrick, Jack Frederick (1915-1967). Hymn. Box 14, folder 1230. undated. https://collections.library.yale.edu/catalog/15530865.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 14, folder 1230"])(undated)[Hymn]. https://collections.library.yale.edu/catalog/15530865.