Acorn, John. Letter
MLA
Kilpatrick, Jack Frederick (1915-1967). Acorn, John. Letter. Box 13, folder 1111. 1916 June 30. https://collections.library.yale.edu/catalog/15504934.
APA, 6th edition
Kilpatrick, Jack Frederick (1915-1967). (["Box 13, folder 1111"])(1916 June 30)[Acorn, John. Letter]. https://collections.library.yale.edu/catalog/15504934.