P. J. O'Rourke (2007). “Give War a Chance: Eyewitness Accounts of Mankind's Struggle Against Tyranny, Injustice, and Alcohol-Free Beer”, p.19, Grove/Atlantic, Inc.
Ebenezer Erskine (1798). “The whole works of the late Rev. Mr. Ebenezer Erskine, minister of the gospel at Stirling: consisting of sermons and discourses, on the most important and interesting subjects”, p.108