MLA

Kilpatrick, Jack Frederick (1915-1967). Song: vocables. Box 6, folder 486. undated. https://collections.library.yale.edu/catalog/15492382.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 6, folder 486"])(undated)[Song: vocables]. https://collections.library.yale.edu/catalog/15492382.