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