Rice, Charles E.
New York University press, 1962
Buku Teks
Mortimer, Charles E.
Publishing, 1983
Buku Teks
Haas, Ernst B.
Stanford University Press, 1970
Buku Teks
Haas, Ernst B.
Standford University Press, 1970
Buku Teks
D.H. Mark Publisher, 1969
Buku Teks