Essential for anybody who wants to use UIA data, as it is the deepest and clearest reference, introducing the organisation and its publications. At the same time, the book is an interesting read for anyone dealing with the international system ... In the different chapters, the authors show great knowledge of the subject they are handling, providing a series of well-known essential references along with more refined publications that are less known, but valuable indeed. It is surely a book that deserves a wide outreach.