An Instance of treason : Ozaki Hotsumi and the sorge spy ring - Johnson, Chalmers A. (Stanford, California : Stanford University Press, 1990)
Includes bibliographical references (p. 299-313) and index.
Keywords: Sorge, Richard, -- 1895-1944.; Ozaki, Hotsumi; Espionage, Soviet -- Japan; Trials (Espionage) -- Japan