Brown Seyom
Columbia University Press , 1983
Buku Teks
Hartmann, Frederick H.
Macmillan, 1985
Buku Teks
Wesson, Robert G.
Houghton Miffiln, 1977
Buku Teks
Bohlen, Charles E.
W.W. Norton & Company, 1969
Buku Teks
Spanier, John
Frederck A. Praeger, 1968
Buku Teks