Coke, Edward (2004). "The First Part of the Institutes of the Lawes of England: Or A Commentary upon Littleton, Not the name of the Author only, but of the Law it selfe; section138, Frankalmoin, part 5". In Sheppard, Steve (ed.). The Selected Writings of Sir Edward Coke(PDF). Liberty Fund. pp.700–701. ISBN0-86597-316-4. Retrieved 17 August 2006.