MLA

Rothwell, William Renfro. Memoranda of Home Voyage from the California Gold Mines to the State of Missouri, 1851 /by William R. Rothwell. 0AD. https://collections.library.yale.edu/catalog/16056603.

APA, 6th edition

Rothwell, W. R. (0 C.E.). Memoranda of home voyage from the California gold mines to the state of Missouri, 1851 /by William R. Rothwell. [Diaries--United States.]. https://collections.library.yale.edu/catalog/16056603.