Consulting

 Dangerous Company by James O'Shea and Charles Madigan  

 The Top Consultant by Calvert Markham

 The Value Creating Consultant by Ron A. Carucci and Toby J. Tetenbaum

Tools

 The Goal by Eliyahu M. Goldratt

 Learning to See by Mike Rother and John Shook

 The Toyota Way by Jeffrey Liker   

 The Six Sigma Way by Peter S. Pande, Robert P. Neuman and Roland R. Cavanagh

 Six Sigma Beyond the Factory Floor by Ron D. Snee and Roger W. Hoerl

Thinking

 The Machine That Changed the World by James P. Womack, Daniel T. Jones

 Lean Thinking by James P. Womack, Daniel T. Jones

 Guide To Management Ideas by Tim Hindle