Ferriss, T. (2016). Tools of titans: The tactics, routines, and habits of billionaires, icons, and world-class performers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFerriss, Timothy. Tools of Titans: The Tactics, Routines, and Habits of Billionaires, Icons, and World-class Performers. 2016.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFerriss, Timothy. Tools of Titans: The Tactics, Routines, and Habits of Billionaires, Icons, and World-class Performers. 2016.
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