MLA

Agnes Ledgerwood Hately Wilson, WaKeeney, Kansas, Letter to Mary Ann Atkinson Hately Macfie, Whithorn, Scotland. 1879. https://collections.library.yale.edu/catalog/16719983.

APA, 6th edition

Agnes Ledgerwood Hately Wilson, WaKeeney, Kansas, letter to Mary Ann Atkinson Hately Macfie, Whithorn, Scotland. (1879). [Correspondence, Manuscripts]. https://collections.library.yale.edu/catalog/16719983.