MLA

Kilpatrick, Jack Frederick (1915-1967). "Covenant" hymn. Box 7, folder 569. undated. https://collections.library.yale.edu/catalog/15492869.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 7, folder 569"])(undated)["Covenant" hymn]. https://collections.library.yale.edu/catalog/15492869.