MLA

Hermant, Abel, 1862-1950. Abel Hermant letters to George Hall. Box 1 | Folder 3. 1889-90. https://collections.library.yale.edu/catalog/11406026.

APA, 6th edition

Hermant, Abel, 1862-1950. (["Box 1 | Folder 3"])(1889-90)[Abel Hermant letters to George Hall]. https://collections.library.yale.edu/catalog/11406026.