the literature on development. Look braodly: economic, political, social. Lots of stuff from the anthropologists, particularly relevant at the tactical level. This literature dates from the 1950s and there is a tremendous amount of good stuff that has been forgotten and/or never assimilated by others outside the disciplines that produced it. Key here is to look for stuff that is outside the places you have already looked and integrate it with your project management and interagency stuff.

Good luck

Cheers

JohnT