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Joseph Lancaster (1803). “Improvements in Education, as it Respects the Industrious Classes of the Community: Containing, a Short Account of Its Present State, Hints Towards Its Improvement, and a Detail of Some Practical Experiments Conducive to that End”, p.50
Walter Kohn, Matthias Scheffler, Peter Weinberger (2003). “Walter Kohn: Personal Stories and Anecdotes Told by Friends and Collaborators”, p.295, Springer Science & Business Media
John Norris, Mary Astell (1705). “Letters concerning the love of God, between the author of the Proposal to the ladies, and Mr. John Norris: wherein his late discourse, showing that it ought to be intire and exclusive of all other loves, is further cleared and justified”, p.53