William Penn (1849). “A key, opening the way to every capacity how to distinguish the religion professed by the people called Quakers, from the perversions and misrepresentations of their adversaries: With a brief exhortation to all sorts of people ...”, p.4
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.839