Schapiro, L. B. (1955). The origin of the communist autocracy: Political opposition in the Soviet State, first phase, 1917-1922. School of Economics and Political Science, University of London.

Schapiro, Leonard Bertram. The Origin of the Communist Autocracy: Political Opposition in the Soviet State, First Phase, 1917-1922. London: School of Economics and Political Science, University of London, 1955.

Schapiro, Leonard Bertram. The Origin of the Communist Autocracy: Political Opposition in the Soviet State, First Phase, 1917-1922. School of Economics and Political Science, University of London, 1955.