MLA

Hahn, Reynaldo, 1875-1947. Letters to Angèle Duglé. Box 1 | Folder 2. 1907-1908. https://collections.library.yale.edu/catalog/16686272.

APA, 6th edition

Hahn, Reynaldo, 1875-1947. (["Box 1 | Folder 2"])(1907-1908)[Letters to Angèle Duglé]. https://collections.library.yale.edu/catalog/16686272.