MLA

Watkins, Carleton E., 1829-1916. Mormon Bar. Folder 14. [ca. 1860-1861]. https://collections.library.yale.edu/catalog/2017932.

APA, 6th edition

Watkins, Carleton E., 1829-1916. (["Folder 14"])([ca. 1860-1861])[Mormon Bar]. https://collections.library.yale.edu/catalog/2017932.