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.852
William Penn (1981). “The Papers of William Penn, Volume 5: William Penn's Published Writings, 1660-1726: An Interpretive Bibliography”, p.177, University of Pennsylvania Press
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.852