Nevins, Allan, 1890-1971
Quadrangle Books, 1963
Buku Teks
Marwick, Arthur
Macmillan, 1970
Buku Teks
Rowse, A.L.
Hodder & Stoughton, 1946
Buku Teks
Thompson, James Westfall
Macmillan, 1958
Buku Teks
Barraclough, Geoffrey, 1908-1984
Basil Blackwell, 1957
Buku Teks