MLA

Cable, George Washington, 1844-1925. Letter : Paradise Road, Northampton, Massachusetts, to [Joseph] Jefferson. Box 7, folder GROUP 118, F-10. 1889 Jul 23. https://collections.library.yale.edu/catalog/17234162.

APA, 6th edition

Cable, George Washington, 1844-1925. (["Box 7, folder GROUP 118, F-10"])(1889 Jul 23)[Letter : Paradise Road, Northampton, Massachusetts, to [Joseph] Jefferson]. https://collections.library.yale.edu/catalog/17234162.