Ferriss, T. 4 Hour Work Week. Random House.
Cita Chicago (17th ed.)Ferriss, Timothy. 4 Hour Work Week. Random House.
Cita MLA (8th ed.)Ferriss, Timothy. 4 Hour Work Week. Random House.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)