Carlton, G. (1965). Friedrich Engels: The shadow prophet. Pall Mall Press.
芝加哥风格引文Carlton, Grace. Friedrich Engels: The Shadow Prophet. London: Pall Mall Press, 1965.
MLA引文Carlton, Grace. Friedrich Engels: The Shadow Prophet. Pall Mall Press, 1965.
警告：这些引文格式不一定是100％准确.