Robert Boyle (1738). “The Philosophical Works of the Honourable Robert Boyle Esq; Abridged, Methodized, and Disposed Under the General Heads of Physics, Statics, Pneumatics, Natural History, Chymistry, and Medicine. The Whole Illustrated with Notes, Containing the Improvements Made in the Several Parts of Natural and Experimental Knowledge Since His Time. In Three Volumes. By Peter Shaw, M.D.”, p.28
Tyler Cowen (2008). “Discover Your Inner Economist: Use Incentives to Fall in Love, Survive Your Next Meeting, and Motivate Your Den tist”, p.41, Penguin