MLA

Hahn, Reynaldo, 1875-1947. Letters to Angèle Duglé. Box 1 | Folder 3. 1909-1913. https://collections.library.yale.edu/catalog/16686273.

APA, 6th edition

Hahn, Reynaldo, 1875-1947. (["Box 1 | Folder 3"])(1909-1913)[Letters to Angèle Duglé]. https://collections.library.yale.edu/catalog/16686273.