MLA

Dunbar, Rudolph, 1899-1988. Various Portraits. Box 5 (Oversize), folder 63. Circa 1938-1986. https://collections.library.yale.edu/catalog/31923020.

APA, 6th edition

Dunbar, Rudolph, 1899-1988. (["Box 5 (Oversize), folder 63"])(Circa 1938-1986)[Various Portraits]. https://collections.library.yale.edu/catalog/31923020.