Gorbachev's interview to the Russian Service of BBC of 16 August 2001 (Ρωσικά)[1]
books.google.com
Mark Kramer, "The Dialectics of Empire: Soviet Leaders and the Challenge of Civil Resistance in East-Central Europe, 1968–91", in Adam Roberts and Timothy Garton Ash (eds.), Civil Resistance and Power Politics: The Experience of Non-violent Action from Gandhi to the Present, Oxford University Press, 2009 pp. 108–09.