Peter Senge (2012). “Schools That Learn (updated and revised second edition): A Fifth Discipline Fieldbook for Educators, Parents, and Everyone Who Cares About Education”, p.100, Nicholas Brealey Publishing
Peter Senge (2012). “Schools That Learn (updated and revised second edition): A Fifth Discipline Fieldbook for Educators, Parents, and Everyone Who Cares About Education”, p.342, Nicholas Brealey Publishing