MLA

Ozick, Cynthia (April 17, 1928). Hallote, Bernard. Box 303. 1945, undated. https://collections.library.yale.edu/catalog/33551689.

APA, 6th edition

Ozick, Cynthia (April 17, 1928). (["Box 303"])(1945, undated)[Hallote, Bernard]. https://collections.library.yale.edu/catalog/33551689.