I thought these will help you in EDM planning: 

Richard Stutely's Business Plan is an exceptionally readable and practical guide that will help you write the commercial aspects of an Enterprise Data Plan.

Ed Tozer's IS/IT Planning book book cuts through the complexities of enterprise planning and presents a cohesive, practical approach

 'The Art of War'.  No, this isn't the usual Chinese one that everyone recommends.  It is a compilation that describes great military commanders.  It provides tremendous insight into both long and short term strategic thinking and planning.  

'Processes and costs' is a mine of useful information.  Simcorp Labs have great material for data planning.

TOGAF is in here as a plug for the commendable Open Group initiative.  Useful reference.


EDM books!