Deutscher, Isaac, 1907-1967. The unfinished revolution: Russia 1917-1967; : the George Macaulay Trevelyan lectures delivered in the University of Cambridge, January-March 1967. [electronic resource] . — London, New York [etc.] : Oxford U.P.,, 1967.. — [7], 115 p. 22 1/2 cm. - The Trevelyan lectures, 1967.