Benjamin Whichcote, Anthony Tuckney (1753). “Moral and religious aphorisms [collected by J. Jeffery from the papers of B. Whichcote]. Now re-publ., with additions, by S. Salter. To which are added, Eight letters: which passed between dr. Whichcote, and dr. Tuckney”, p.113
Neil Postman (2009). “Teaching As a Subversive Activity: A No-Holds-Barred Assault on Outdated Teaching Methods-with Dramatic and Practical Proposals on How Education Can Be Made Relevant to Today's World”, p.71, Delta