MLA

Dunbar, Rudolph, 1899-1988. Affidavit. Box 2, folder 37. 1973. https://collections.library.yale.edu/catalog/17398747.

APA, 6th edition

Dunbar, Rudolph, 1899-1988. (["Box 2, folder 37"])(1973)[Affidavit]. https://collections.library.yale.edu/catalog/17398747.