I came across this link while I was researching "adaptive leadership". It is a nice summary of leadership theories. I might use this in some courses I teach.
http://www.apsc.gov.au/publications-and-media/current-publications/thinking-about-leadership-a-brief-history-of-leadership-thought
http://www.apsc.gov.au/publications-and-media/current-publications/thinking-about-leadership-a-brief-history-of-leadership-thought