This book explains agile Management, gives theoretical backgrounds and describes in small steps, how to lead and manage in an agile way.
Link: https://books.google.de/books?hl=de&lr=&id=2X4hBQAAQBAJ&oi=fnd&pg=PR11&dq=agile+management&ots=TGAGYMbwZ2&sig=eZV72zI7ddwCkLtq4LI4f_Nddbw#v=onepage&q=agile%20management&f=false