MLA

Hersey, John, 1914-1993. The Wall, notes. Box 49. 1945-1950. https://collections.library.yale.edu/catalog/2057495.

APA, 6th edition

Hersey, John, 1914-1993. (["Box 49"])(1945-1950)[The Wall, notes]. https://collections.library.yale.edu/catalog/2057495.