Gopalakrishnan, R. (2010). When the Penny Drops. Portfolio Penguin.
芝加哥风格引文Gopalakrishnan, R. When the Penny Drops. Portfolio Penguin, 2010.
MLA引文Gopalakrishnan, R. When the Penny Drops. Portfolio Penguin, 2010.
警告：这些引文格式不一定是100％准确.
APA引文