1. World Trends in Tourism and Recreation;Mieczkowski,1990
2. International Tourism In The Soviet Union In The Era Of Glasnost And Perestroyka;Arefyev;Journal of Travel Research,1991
3. Acording to CBC radio, 27 September 1991.
4. Winnipeg Free Press, 13 May 1991.
5. Chernobyl beckons tourists to visit the radiation zone;Clines;New York Times,1991