Ferriss, T. (2016). Tools of titans: The tactics, routines, and habits of billionaires, icons, and world-class performers. Houghton Mifflin Harcourt.
Παραπομπή σε μορφή Chicago (17η εκδ.)Ferriss, Timothy. Tools of Titans: The Tactics, Routines, and Habits of Billionaires, Icons, and World-class Performers. Boston, New York: Houghton Mifflin Harcourt, 2016.
Παραπομπή σε μορφή MLA (9th εκδ.)Ferriss, Timothy. Tools of Titans: The Tactics, Routines, and Habits of Billionaires, Icons, and World-class Performers. Houghton Mifflin Harcourt, 2016.
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