Sakharov, Andrei D.
Norton & Company, 1968
Buku Teks
Woytinsky, W.S.
Vanguard Press, 1961
Buku Teks
Kennan, George F., 1904-, author
An Atlantic Monthly Press Book, 1961
Buku Teks
Oxford University Press, 1951
Buku Teks
Werth, Alexander
Hill and Wang, 1961
Buku Teks