Sir Isaac Newton, Roger Cotes (1850). “Correspondence of Sir Isaac Newton and Professor Cotes: Including Letters of Other Eminent Men Now First Published from the Originals in the Library of Trinity College, Cambridge; Together with an Appendix, Containing Other Unpublished Letters and Papers by Newton; with Notes, Synoptical View of the Philosopher's Life, and a Variety of Details Illustrative of His History”, p.284