I have found the following web sites to be informative and useful: 

• Resource Technologies Incorporated provides sales, management and customer service assessments and IMPACT Sales Training programs
   
• J.D. Hunter Associates a Servant Leadership Training & Development Firm founded by Jim Hunter in 1985.  Jim is the author of the internationally best-selling book The Servant, subtitled A Simple Story About the True Essence of Leadership. 

 BOOKS THAT I HAVE READ AND RECOMMEND:

• Operation Pineapple Express, Lt. Col. Scott Mann (Ret) - Rescuing Afghan Co-combatants after the U.S. withdrawal

• Shoe Dog, Phil Knight - a memoir by the creator of Nike

• The Servant, James Hunter - the true essence of Leadership

• Extreme Ownership, Jocko Willink and Leif Babbin - How US Navy Seals lead and win.

• In the Company of Heroes, Michael J. Durant with Steve Hartov - The true account of Blackhawk Down