Thompson, James Westfall
Macmillan, 1958
Buku Teks
Butterfield, Herbert
Cambridge University Press, 1969
Buku Teks
Butterfield, Herbert
Cambridge University Press, 1955
Buku Teks
Tosh, John
Longman , 1991
Buku Teks
Brundage, Anthony, 1938-
John Wiley & Sons, Inc., 2018
Buku Teks