Kelly, Alfred H., author
W.W. Norton, 1948
Buku Teks
Kelly, Alfred H., author
W.W. Norton, 1983
Buku Teks
Conze, Edward, 1904-1979
Harper Brothers Publisher, 1959
Buku Teks
Agnew, Hugh E.
McGraw-Hill , 1951
Buku Teks
Neef, Dale
Upper Saddle River, N.J. Prenctice Hall 2001,
Buku Teks