William Penn (1726). “A Collection of the Works of William Penn: To which is Prefixed a Journal of His Life, with Many Original Letters and Papers Not Before Published”, p.840
William Penn (1793). “Fruits of a Father's Love: being the Advice of William Penn to his children, relating to their civil and religious conduct, etc. With a preface, signed J. R., i.e. Sir John Rodes”, p.4