Plumb, J.H. (John Harold), 1911-
Macmillan, 1969
Buku Teks
Butterfield, Herbert, author
Cambridge University Press, 1969
Buku Teks
Butterfield, Herbert, author
Cambridge University Press, 1955
Buku Teks
Hicks Smith & Sons, 1978
Buku Teks
Cohen, Paul A., author
Routledge, 2003
Buku Teks