Marwick, Arthur
Macmillan, 1970
Buku Teks
Rowse, A.L.
Hodder & Stoughton, 1946
Buku Teks
Thompson, James Westfall, author
Macmillan, 1958
Buku Teks
Barraclough, Geoffrey, 1908-1984
Basil Blackwell, 1957
Buku Teks
Gottschalk, Louis, author
Alfred A. Knoff, 1969
Buku Teks