MLA

Welsh, Herbert, 1851-1941. Welsh, Herbert. Box 1 | Folder 27. 1893 January 27. https://collections.library.yale.edu/catalog/17157731.

APA, 6th edition

Welsh, Herbert, 1851-1941. (["Box 1 | Folder 27"])(1893 January 27)[Welsh, Herbert]. https://collections.library.yale.edu/catalog/17157731.