MLA

Granger, Lester B. (Lester Blackwell), 1896-1976. National Urban League. Box 4, folder 78. 1945-1961. https://collections.library.yale.edu/catalog/16750184.

APA, 6th edition

Granger, Lester B. (Lester Blackwell), 1896-1976. (["Box 4, folder 78"])(1945-1961)[National Urban League]. https://collections.library.yale.edu/catalog/16750184.