Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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