APA (7th ed.) Citation

kaufman, J. (2013). The first 20 hours: How to learn anything fast. Portfolio Penguin.

Chicago Style (17th ed.) Citation

kaufman, Josh. The First 20 Hours: How to Learn Anything Fast. London: Portfolio Penguin, 2013.

MLA (9th ed.) Citation

kaufman, Josh. The First 20 Hours: How to Learn Anything Fast. Portfolio Penguin, 2013.

Warning: These citations may not always be 100% accurate.