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Allen, Barbara. Alexander Shlyapnikov, 1885–1937: Life of an Old Bolshevik. Leiden, The Netherlands: Brill, January 2015. Historical Materialism Series. http://www.brill.com/products/book/alexander-shlyapnikov-1885-1937. Paperback published by Haymarket Books in 2016. http://www.haymarketbooks.org/pb/Alexander-Shlyapnikov-1885-1937.

Daniels, Robert. The Conscience of the Revolution: Communist Opposition in Soviet Russia. Cambridge, Mass., 1960; revised edition, Boulder, Col., 1988.

Holmes, Larry E. For the Revolution Redeemed: The Workers Opposition in the Bolshevik Party, 1919-1921. The Carl Beck Papers in Russian and East European Studies, no. 802 (1990).

Kollontai, Alexandra. Rabochaya oppozitsiya. Moscow, 1921. Translated into English by Solidarity in London and the IWW in the United States.

Sorenson, Jay. The Life and Death of Soviet Trade Unionism: 1917-1928. New York, 1969.