MLA

Turgenev, Ivan Sergeevich, 1818-1883. Letter : Bougival, France, to Frederic Harrison. Box 28, folder GROUP 522, F-2. 1882 Sep 10. https://collections.library.yale.edu/catalog/32600858.

APA, 6th edition

Turgenev, Ivan Sergeevich, 1818-1883. (["Box 28, folder GROUP 522, F-2"])(1882 Sep 10)[Letter : Bougival, France, to Frederic Harrison]. https://collections.library.yale.edu/catalog/32600858.