MLA

Kilpatrick, Jack Frederick (1915-1967). Song. Box 1, folder 83. undated. https://collections.library.yale.edu/catalog/15492083.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 1, folder 83"])(undated)[Song]. https://collections.library.yale.edu/catalog/15492083.