McCauley, Martin
Longman, 1993
Buku Teks
Agzamkhojayev, A., author
Foreign Language Publishing House, [date of publication not identified]
Buku Teks
Shteppa, Konstantin F., author
Rutgers University Press, 1962
Buku Teks
Shacford, R.H., author
Public Affairs Press, 1952
Buku Teks
Rauch, Georg von, author
Frederick A. Preager , 1957
Buku Teks