Review of the hardback: 'The book attempts to not restrain itself to a narrow perspective; it encloses legal and socio-political accounts, scholars from the European as well as the international level, promoters and sceptics and voices from different theoretical backgrounds such as Kelsenian, system theories and Habermas. … This book … shows that it is important to deviate from the standard perception of a constitution as a single mono-level document in favour of constituting elements assembled from national, regional and international documents. Definitely it is a book that has the potential to kindle further discussion and give an overview of what has been reached so far.' Eva Julia Lohse, internationalconstitutionallaw.net