Trotsky, L. 1936b. Interview with Trotsky. Socialist Appeal Vol. 2, no. 9 (Sept. 1936) (http://www.marxists.org/archive/trotsky/1936/09/moscowtrial.ht).

Trotsky, L. 1936a. "Stalin Frame-Up Mill At Work". First published in

New Militant, 26.2.1936 (http://www.marxists.org/archive/trotsky/1935/09/frameup.htm).

Trotsky, L. 1935b. "Romain Rolland Executes an Assignment". First published

in The New International, vol. II, no. 7 (Dec. 1935) (http://www.marxists.org/archive/trotsky/1935/10/romain.htm).

Volkogonov, D. 1991. Triumph and Tragedy. London: Weidenfeld and Nicolson.

Wynn, C. 2008. "The 'Smirnov-Eismont-Tolmachev Affair'". The Lost Politburo Transcripts. From Collective Rule to Stalin's Dictatorship. London, New Haven: Yale UP.

Tucker, R. C. 1990. Stalin in Power. The Revolution from Above, 1928-1941. NY: Norton.

Tucker, R. C. 1992. "On the 'Letter of an Old Bolshevik' as an Historical Document". Slavic Review, vol. 51, no. 4.

Ulam, A. 1973. Stalin. The Man and his Era. NY: Viking Press.

Zagoria, J. D. ed. 1966. Power and the Soviet Elite: The "Letter of an Old Bolshevik" and Other Essays by Boris I. Nicolaevsky. London: Pall Mall Press.