Richman, Barry M.
Random House , 1969
Buku Teks
Basil Blackwell for the United Nations Industrial Development Organization, 1991
Buku Teks
Chang, John K.
Aldine, 1969
Buku Teks
Barnett, Arthur Doak
Frederick A. Praeger, 1962
Buku Teks
Eckstein, Alexander
Free Press, 1961
Buku Teks