MLA

Dunbar, Rudolph, 1899-1988. Ceremonial state visit to Zaire. Box 2, folder 41. 1973. https://collections.library.yale.edu/catalog/17398751.

APA, 6th edition

Dunbar, Rudolph, 1899-1988. (["Box 2, folder 41"])(1973)[Ceremonial state visit to Zaire]. https://collections.library.yale.edu/catalog/17398751.