MLA

Harkins, G. W. (George Willis), 1836-1890. To the Choctaw people, brethren and friends. On the 24th August last, I addressed a letter to Tandy Walker .... [1858]. https://collections.library.yale.edu/catalog/2111671.

APA, 6th edition

Harkins, G. W. (George Willis), 1836-1890. ([1858])[To the Choctaw people, brethren and friends. On the 24th August last, I addressed a letter to Tandy Walker ...]. https://collections.library.yale.edu/catalog/2111671.