APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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