edited by George T. Yu
Westview, 1977
Buku Teks
Roskin, Michael G.
Pearson/Prentice Hall, 2004
Buku Teks
Michael, Franz
Henry Holt and Co., 1956
Buku Teks
Lanyi, George A.
Random House , 1966
Buku Teks
Carr, Edward Hallet
Harver Torchbooks, 1947
Buku Teks