O. C. Gibbs, Chicago, Illinois, letter to James Kinnier Wilson, WaKeeney, Kansas
MLA
O. C. Gibbs, Chicago, Illinois, Letter to James Kinnier Wilson, WaKeeney, Kansas. 1878. https://collections.library.yale.edu/catalog/16719982.
APA, 6th edition
O. C. Gibbs, Chicago, Illinois, letter to James Kinnier Wilson, WaKeeney, Kansas. (1878). [Correspondence, Manuscripts]. https://collections.library.yale.edu/catalog/16719982.