APA (7e ed.) Bronvermelding

Ferriss, T. (2016). Tools of titans: The tactics, routines, and habits of billionaires, icons, and world-class performers. Houghton Mifflin Harcourt.

Chicago (17e ed.) Bronvermelding

Ferriss, Timothy. Tools of Titans: The Tactics, Routines, and Habits of Billionaires, Icons, and World-class Performers. Boston, New York: Houghton Mifflin Harcourt, 2016.

MLA (9e ed.) Bronvermelding

Ferriss, Timothy. Tools of Titans: The Tactics, Routines, and Habits of Billionaires, Icons, and World-class Performers. Houghton Mifflin Harcourt, 2016.