MLA

Stoker, Bram, 1847-1912. Stoker, Bram. Box 1 | Folder 68. 1893 [November 9?]. https://collections.library.yale.edu/catalog/17219417.

APA, 6th edition

Stoker, Bram, 1847-1912. (["Box 1 | Folder 68"])(1893 [November 9?])[Stoker, Bram]. https://collections.library.yale.edu/catalog/17219417.