Leadership Development: Drucker

I just got my first Drucker book in the mail from Amazon, The Essential Drucker : The Best of Sixty Years of Peter Drucker’s Essential Writings on Management. This is a busy year in developing ministry leaders at our church so I’m trying to read a lot of resources on leadership to help equip our people.

Book Description: Father of modern management, social commentator, and preeminent business philosopher, Peter F. Drucker has been analyzing economics and society for more than sixty years. Now for readers everywhere who are concerned with the ways that management practices and principles affect the performance of the organization, the individual, and society, there is The Essential Drucker — an invaluable compilation of management essentials from the works of a management legend.
Containing twenty-six selections, The Essential Drucker covers the basic principles and concerns of management and its problems, challenges, and opportunities, giving managers, executives, and professionals the tools to perform the tasks that the economy and society of tomorrow will demand of them.

Any other good suggestion on leadership books?