Eastman, M. (1925). Leon Trotsky: The portrait of a youth. Greenberg, inc.
芝加哥风格引文Eastman, Max. Leon Trotsky: The Portrait of a Youth. New York: Greenberg, inc, 1925.
MLA引文Eastman, Max. Leon Trotsky: The Portrait of a Youth. Greenberg, inc, 1925.
警告：这些引文格式不一定是100％准确.