Dewdney, John C.
Pergamon Press, 1979
Buku Teks
edited by Terence Emmons and Wayne S. Vucinich
Cambridge University Press, 2011
Buku Teks
Dunlop, John B, author
Princeton University Press, 1983
Buku Teks
Kennan, George F., 1904-, author
An Atlantic Monthly Press Book, 1961
Buku Teks
Oxford University Press, 1951
Buku Teks