Lamont, Dauglas F., author
Basic Books, 1979
Buku Teks
Fordham University Press , 1962
Buku Teks
Fry, Earl H., author
McGraw-Hill, 1980
Buku Teks
McCamy, James L., author
Alfred A. Knopf, 1952
Buku Teks
Kennan, George F., 1904-, author
Princeton University Press , 1954
Buku Teks