Lionel F. Stapley 
It’s an Emotional Game [PDF ebook] 
Learning about Leadership from Football

Based on work in the anxiety-provoking and emotional environment of professional football, this book explores the effect that emotions have on the relationships and relatedness of team members; and, the struggles experienced in controlling and managing emotions by leaders and managers of teams. More specifically, this book explores the conflicts associated with the process of managing the boundary between what is inside and what is outside: between what is in the manager’s mind and what is happening in the external environment.