Gopalkrishnan , R. (2010). When The Penny Drops: Learning What Not Taught. Penguin.
芝加哥风格引文Gopalkrishnan , R. When The Penny Drops: Learning What Not Taught. Delhi: Penguin, 2010.
MLA引文Gopalkrishnan , R. When The Penny Drops: Learning What Not Taught. Penguin, 2010.
警告：这些引文格式不一定是100％准确.