1. Albert, R., 2022, Discretionary Referendums in Constitutional Amendment, in: Albert, R., Stacey, R., 2022, The Limits and Legitimacy of Referendums, Oxford, Oxford University Press;
2. Auer, A., 1978, Les droit politiques dans les cantons Suisses, Geneva, Libraririe de l'Université George et Cie S.A;
3. Barshack, L., 2006, Constituent Power as Body: Outline of a Constitutional Theology, The University of Toronto Law Journal, Vol. 56, No. 3;
4. Bernstein, D. E., Reverse Carolene Products, the End of the Second Reconstruction, and Other Thoughts on Schuette v. Coalition to Defend Affirmative Action, Cato Supreme Court Review (2013-2014);
5. Böckenförde, E. W., Democracia y representación. Critica a la discusión actual sobre la democracia, in: 2000, Estudios sobre el Estado de Derecho y la democracia, Madrid, Editorial Trota;