MLA

Byron, Robert, 1905-1941. Douglas, Norman. Box 8, folder 143. 1934-1937. https://collections.library.yale.edu/catalog/17300505.

APA, 6th edition

Byron, Robert, 1905-1941. (["Box 8, folder 143"])(1934-1937)[Douglas, Norman]. https://collections.library.yale.edu/catalog/17300505.