MLA

Yung, Wing, 1828-1912. Gallaudet, Thomas Hopkins. Box 1, folder 4 | reel 1U. 1848. https://collections.library.yale.edu/catalog/10013182.

APA, 6th edition

Yung, Wing, 1828-1912. (["Box 1, folder 4 | reel 1U"])(1848)[Gallaudet, Thomas Hopkins]. https://collections.library.yale.edu/catalog/10013182.