Jaceb, E. F.
The fifteenth century : 1399-1485
Clarendon Press, 1961
 Buku Teks SO
Cook, Chris
A Short history of the liberal party / Chris Cook
Macmillan Press , 1989
 Buku Teks SO
Cook, Chris
A Short history of the liberal party / Chris Cook
Macmillan Press , 1984
 Buku Teks SO
Trevelyan, George Macaulay, 1876-1962
Illustrated English social history; Volume three : the eighteenth century
Longmans, Green, 1951
 Buku Teks SO
Laski, Harold J.
Reflections on the constitution the House of commons, the cabinet, the civil service
Manchester University Press, 1951
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