MLA

Douglas, Norman, 1868-1952. "Love Among The Ruins": manuscript draft. Box 15, folder 197. [1928]. https://collections.library.yale.edu/catalog/16454706.

APA, 6th edition

Douglas, Norman, 1868-1952. (["Box 15, folder 197"])([1928])["Love Among The Ruins": manuscript draft]. https://collections.library.yale.edu/catalog/16454706.