Cottrell, D. (2017). The First Two Rules of Leadership (1st.). Wiley.
Cita Chicago (17th ed.)Cottrell, David. The First Two Rules of Leadership. 1st. Wiley, 2017.
Cita MLA (9th ed.)Cottrell, David. The First Two Rules of Leadership. 1st. Wiley, 2017.
Atenció: Aquestes cites poden no estar 100% correctes.