APA (7th ed.) Citation

Thomas, W. f. 1. (1716). A letter to Robert Walpole Esqr. s.n.

Chicago Style (17th ed.) Citation

Thomas, William fl. 1716. A Letter to Robert Walpole Esqr. [London?]: s.n, 1716.

MLA (9th ed.) Citation

Thomas, William fl. 1716. A Letter to Robert Walpole Esqr. s.n, 1716.