Bemis, Samuel Flagg, 1891-1973, author
Alfred A. Knopf, 1949; 1956
Buku Teks
Lovel, John P
Macmillan, 1985
Buku Teks
Spanier, John
Frederck A. Praeger, 1968
Buku Teks
Kennan, George F., 1904-, author
Princeton University Press , 1954
Buku Teks
McCormick, James M., author
Thomson, 2005
Buku Teks