MLA

Byron, Robert, 1905-1941. Outline, holograph; draft, typescript. Box 37, folder 592. circa 1938. https://collections.library.yale.edu/catalog/17464839.

APA, 6th edition

Byron, Robert, 1905-1941. (["Box 37, folder 592"])(circa 1938)[Outline, holograph; draft, typescript]. https://collections.library.yale.edu/catalog/17464839.