MLA

Clark, Rodney, 1824-1887. Rodney Clark, Rail Road Flat, California, to Wilson Hart Clark, New Haven, Connecticut. Box 1 | Folder 12. 1858 February 15. https://collections.library.yale.edu/catalog/17356872.

APA, 6th edition

Clark, Rodney, 1824-1887. (["Box 1 | Folder 12"])(1858 February 15)[Rodney Clark, Rail Road Flat, California, to Wilson Hart Clark, New Haven, Connecticut]. https://collections.library.yale.edu/catalog/17356872.