Carr, E.H., (1964) Socialism In One Country 1924–1926, Vol. Three. Macmillan, London.
3.
Claudin, F. (1975) The Communist Movement: From Comintern To Cominform. Peregrine, Harmondsworth.
4.
Deutscher, I. (1967) Stalin, A Political Biography, Oxford University Press, London.
5.
Lenin, V.I. (1960–70) Collected Works, Vols. 31 and 33, (Fourth ed.) Lawrence and Wishart, London.
6.
Luxemburg, R. (1972) Selected Political Writings, Ed. R. Looker, Jonathan Cape, London.
7.
Medvedev, R. (1972) Let History Judge, Macmillan, London.
8.
Trotsky, L.D. (1928) The Draft Programme of the Communist International—A Criticism of Fundamentals. In The Third International After Lenin, Pathfinder Press, New York, 1970.
9.
Trotsky, L.D., (1930) Introduction to the German Edition of The Permanent Revolution. In The Permanent Revolution & Results And Prospects, Merit Publishers, New York, 1969.
10.
Trotsky, L.D. (1937) The Revolution Betrayed, Faber and Faber, London.
