MLA

Bennett, Arnold, 1867-1931. "Books & Persons," autograph manuscript, signed, London. Box 3, folder 61. 1930 Jul 12. https://collections.library.yale.edu/catalog/16537934.

APA, 6th edition

Bennett, Arnold, 1867-1931. (["Box 3, folder 61"])(1930 Jul 12)["Books & Persons," autograph manuscript, signed, London]. https://collections.library.yale.edu/catalog/16537934.