Charles Babbage's remarks in November 1839, recalling events in 1821; as quoted in Harry Wilmot Buxton and Anthony Hyman "Memoir of the Life and Labours of the Late Charles Babbage", 1988.
Alexander Hamilton (1850). “The works of Alexander Hamilton: comprising his correspondence, and his political and official writings, exclusive of the Federalist, civil and military. Published from the original manuscripts deposited in the Department of State, by order of the Joint Library Committee of Congress”, p.9
William Shakespeare (2013). “Making Sense of Measure for Measure! a Students Guide to Shakespeare's Play (Includes Study Guide, Biography, and Modern Retelli”, p.87, BookCaps Study Guides