[Autograph letter signed] 1851 February 4, Eldorado County, California [to] Mary Gish
MLA
[Autograph Letter Signed] 1851 February 4, Eldorado County, California [to] Mary Gish. 1851. https://collections.library.yale.edu/catalog/2040965.
APA, 6th edition
[Autograph letter signed] 1851 February 4, Eldorado County, California [to] Mary Gish. (1851). [Correspondence, Gold rush diaries, Overland journals]. https://collections.library.yale.edu/catalog/2040965.