MLA

Kilpatrick, Jack Frederick (1915-1967). Hymn. Box 13, folder 1135. undated. https://collections.library.yale.edu/catalog/15515931.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 13, folder 1135"])(undated)[Hymn]. https://collections.library.yale.edu/catalog/15515931.