Steenson, G. P. (1978). Karl Kautsky, 1854-1938: Marxism in the classical years. University of Pittsburgh Press.
芝加哥风格引文Steenson, Gary P. Karl Kautsky, 1854-1938: Marxism in the Classical Years. Pittsburgh: University of Pittsburgh Press, 1978.
MLA引文Steenson, Gary P. Karl Kautsky, 1854-1938: Marxism in the Classical Years. University of Pittsburgh Press, 1978.
警告：这些引文格式不一定是100％准确.