MLA

Saltus, Edgar, 1855-1921. "Barbey d'Aurevilly," story. Box 1. 1919 February. https://collections.library.yale.edu/catalog/17151255.

APA, 6th edition

Saltus, Edgar, 1855-1921. (["Box 1"])(1919 February)["Barbey d'Aurevilly," story]. https://collections.library.yale.edu/catalog/17151255.