MLA

Welsh, Herbert, 1851-1941. Welsh, Herbert. Box 1 | Folder 33. 1893 January 31. https://collections.library.yale.edu/catalog/17157737.

APA, 6th edition

Welsh, Herbert, 1851-1941. (["Box 1 | Folder 33"])(1893 January 31)[Welsh, Herbert]. https://collections.library.yale.edu/catalog/17157737.