Liebknecht, W., & Untermann, E. (1901). Karl Marx: Biographical memoirs. Chicago: Charles H. Kerr & company.
芝加哥风格引文Liebknecht, Wilhelm, 与 Ernest Untermann. Karl Marx: Biographical Memoirs. Chicago: Charles H. Kerr & company, 1901.
MLA引文Liebknecht, Wilhelm, 与 Ernest Untermann. Karl Marx: Biographical Memoirs. Chicago: Charles H. Kerr & company, 1901.
警告：这些引文格式不一定是100％准确.