Thomas Clarkson, William Penn (1827). “Memoirs of the private and public life of William Penn: who settled the state of Pennsylvania, and founded the city of Philadelphia”
Thomas Clarkson, William Penn (1827). “Memoirs of the private and public life of William Penn: who settled the state of Pennsylvania, and founded the city of Philadelphia”, p.117
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.834
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