Medley, Dudley J. (1925). A student's manual of English constitutional history (6th ed.). New York: Macmillan. pp. 638–639. hdl:2027/uc1.$b22458. OCLC612680148.
Medley, Dudley J. (1925). A student's manual of English constitutional history (6th ed.). New York: Macmillan. pp. 638–639. hdl:2027/uc1.$b22458. OCLC612680148.