Asimov, I. (2016). Prelude to foundation. Harper Collins.
芝加哥风格引文Asimov, Isaac. Prelude to Foundation. London: Harper Collins, 2016.
MLA引文Asimov, Isaac. Prelude to Foundation. Harper Collins, 2016.
警告：这些引文格式不一定是100％准确.
APA引文