For Sales Engineer Managers, who are looking to expand their knowledge on new techniques and tactics to bring their Sales Engineers to the next level, then I would suggest the following book, The Evolving Sales Engineer. Key Concepts include:

-How to pick talented SEs
-Coaching Tactics
-Managing Office Politics between Account Managers/SEs

The author Edward Levine has a great grasp of the challenging world of Sales Engineering.
I would suggest this book to both SE Managers and SEs alike
Good reading!