MLA

Clark, Warren Vester, 1821-1898. Warren Vester Clark, Rail Road Flat, California, Wilson Hart Clark, New Haven, Connecticut. Box 1 | Folder 33. 1863 January 22. https://collections.library.yale.edu/catalog/17356883.

APA, 6th edition

Clark, Warren Vester, 1821-1898. (["Box 1 | Folder 33"])(1863 January 22)[Warren Vester Clark, Rail Road Flat, California, Wilson Hart Clark, New Haven, Connecticut]. https://collections.library.yale.edu/catalog/17356883.