Lewis, Flora (13 February 1966). "Who Killed Krivitsky?"(PDF). CIA. Washington Post and Times-Herald. Archived from the original(PDF) on January 22, 2017.
Krivitsky, Walter G. (1939). In Stalin's secret service: An Exposé of Russia's Secret Policies by the Former Chief of the Soviet Intelligence in Western Europe. New York: Harper Brothers. pp. 290, 294. LCCN40027004.ISBN0890935491 (1985)
Poretsky, Elisabeth K. (1969). Our Own People: A Memoir of "Ignace Reiss" and His Friends. London: Oxford University Press. pp. 269–270. LCCN70449412.
Serge, Victor (2019). Notebooks 1936—1947. New York: New York Review Books. p. 401. LCCN2018029769.
Krivitsky, Walter G. (1939). In Stalin's Secret Service: An Exposé of Russia's Secret Policies by the Former Chief of the Soviet Intelligence in Western Europe. New York: Harper Brothers. LCCN40027004.
Krivitsky, Walter G. (1939). In Stalin's Secret Service: An Exposé of Russia's Secret Policies by the Former Chief of the Soviet Intelligence in Western Europe. New York: Harper Brothers. LCCN49034777.
Lewis, Flora (13 February 1966). "Who Killed Krivitsky?"(PDF). CIA. Washington Post and Times-Herald. Archived from the original(PDF) on January 22, 2017.