kaufman, J. (2013). The first 20 hours: How to learn anything fast. Portfolio Penguin.
Chicago Style (17th ed.) Citationkaufman, Josh. The First 20 Hours: How to Learn Anything Fast. London: Portfolio Penguin, 2013.
MLA引文kaufman, Josh. The First 20 Hours: How to Learn Anything Fast. Portfolio Penguin, 2013.
警告:這些引文格式不一定是100%准確.