Harvard Business Review, Alex Ferguson, Bill Parcells, Kareem Abdul-Jabbar, Joe Girardi (2018). “HBR's 10 Must Reads on Leadership Lessons from Sports (featuring interviews with Sir Alex Ferguson, Kareem Abdul-Jabbar, Andre Agassi)”, p.48, Harvard Business Press
Edmund Burke (2014). “Revolutionary Writings: Reflections on the Revolution in France and the First Letter on a Regicide Peace”, p.52, Cambridge University Press