Russky Yazyk Publishers, 1994
Buku Referensi
Arakin, V.D., author
1993
Buku Referensi
edited by P. S. Falla
Clarendon Press, 1990
Buku Referensi
Katzner, Kenneth, author
John Wiley & Sons, 1994
Buku Referensi
Segal, Louis, author
Frederick A. Praeger, 1959
Buku Referensi