Simpson, W.O.
Stanley Thornes, 1988
Buku Teks
Nevins, Allan, 1890-1971, author
Anchor Books, 1962
Buku Teks
Nevins, Allan, 1890-1971, author
Quadrangle Books, 1963
Buku Teks
Marwick, Arthur
Macmillan, 1970
Buku Teks
Rowse, A.L.
Hodder & Stoughton, 1946
Buku Teks