Peterson, Christian Philip, author
Routledge, 2012
Buku Teks
McCauley, Martin
Longman, 1993
Buku Teks
Munich : Institute for the Study of the USSR
Majalah, Jurnal, Buletin
Valkenier, Elizabeth Kridl, author
Frederick A. Praeger, 1983
Buku Teks
edited by Kinya Niiseki
Westview Press, 1987
Buku Teks