Peter Hall & Ulrich Pfeiffer 
Urban Future 21 [PDF ebook] 
A Global Agenda for Twenty-First Century Cities

Prepared for the World Commission on Twenty-First Century Urbanization Conference in Berlin in July 2000. This book is an entirely new and comprehensive review of the state of world urban development at the millennium and a forecast of the main issues that will dominate urban debates in the next 25 years. It is the most significant book on cities and city planning problems to appear for many years.