Cottrell, D. (2017). The First Two Rules of Leadership (1st.). Wiley.
Citazione stile Chigago Style (17a edizione)Cottrell, David. The First Two Rules of Leadership. 1st. Wiley, 2017.
Citatione MLA (9a ed.)Cottrell, David. The First Two Rules of Leadership. 1st. Wiley, 2017.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.