MLA

Dunbar, Rudolph, 1899-1988. "F" general. Box 1, folder 13. 1939–1972. https://collections.library.yale.edu/catalog/17398728.

APA, 6th edition

Dunbar, Rudolph, 1899-1988. (["Box 1, folder 13"])(1939–1972)["F" general]. https://collections.library.yale.edu/catalog/17398728.