Trevelyan, George Macaulay, 1876-1962
Longmans, Green, 1945
Buku Teks
Griffin, Dustin
Cambridge University Press, 2009
eBooks
Chesterton, Gilbert Keith, 1874-1936
Chatto , 1951
Buku Teks
Stephen, Sir James Fitzjames
Routledge/Thoemmes Press, 1996
Buku Teks
Clapham, John, Sir
University Press , 1944
Buku Teks