[Autograph letter signed] 1838 January 15, Miss.y Rooms, Boston [to] Mr. A. B. Smith, Oxford, Mass
MLA
Armstrong, William J. (William Jessup), 1796-1846. [Autograph letter signed] 1838 January 15, Miss.y Rooms, Boston [to] Mr. A. B. Smith, Oxford, Mass. Folder 27. 1838 January 15. https://collections.library.yale.edu/catalog/2066888.
APA, 6th edition
Armstrong, William J. (William Jessup), 1796-1846. (["Folder 27"])(1838 January 15)[[Autograph letter signed] 1838 January 15, Miss.y Rooms, Boston [to] Mr. A. B. Smith, Oxford, Mass]. https://collections.library.yale.edu/catalog/2066888.