Ann Griffiths 
Handbook of Federal Countries, 2005 [PDF ebook] 

Unique in its timely scope and depth, this volume begins with a foreword by Forum President Bob Rae that reflects on the importance of the federal idea in the contemporary world and provides an excellent introduction to federalism. New comparative chapters examine the recent draft constitutional treaty in Europe and the possibility of federalism being adopted in two countries with longstanding violent conflicts — Sri Lanka and Sudan.