Law, Politics, and the Constitution: New Perspectives from Legal and Political Theory By Antonia Geisler (editor), Michael Hein (editor), Siri Hummel (editor) 2014 | 217 Pages | ISBN: 3631654642 | PDF | 3 MB
Popular Sovereignty and the Crisis of German Constitutional Law: The Theory and Practice of Weimar Constitutionalism By Heller, Hermann; Caldwell, Peter C.; Kelsen, Hans; Smend, Rudolf; Schmitt, Carl 1997 | 300 Pages | ISBN: 0822319799 | PDF | 21 MB
Hermann Heller, "Sovereignty: A Contribution to the Theory of Public and International Law " English | ISBN: 0198810547 | 2019 | 208 pages | PDF | 2 MB