Singer, P. (2018). Marx: A Very Short Introduction (2nd.). Oxford.
芝加哥风格引文Singer, Peter. Marx: A Very Short Introduction. 2nd. Oxford, 2018.
MLA引文Singer, Peter. Marx: A Very Short Introduction. 2nd. Oxford, 2018.
警告：这些引文格式不一定是100％准确.
APA引文