McCauley, Martin
Longman, 1993
Buku Teks
Munich : Institute for the Study of the USSR
Majalah, Jurnal, Buletin
edited by Kinya Niiseki
Westview Press, 1987
Buku Teks
Grolier Incorporated, 1964
Buku Referensi
[publisher not identified], 1967
Buku Teks