selected by Henry Steele Commager
American Museum of Natural History, 1964
Buku Teks
edited by Henry Steele Commager
Appleton-Century-Crofts, 1949
Buku Referensi
Roysl Ministry Affairs, 1959
Buku Teks
McCamy, James L., author
Alfred A. Knopf, 1952
Buku Teks
Kennan, George F., 1904-, author
Princeton University Press , 1954
Buku Teks