1. Acton, Lord John Dalberg-Acton. (1906). Lectures on Modern History. London: Macmillan.
2. Balcells, A. (Ed.). (2015). La Mancomunitat de Catalunya (1914); centennial symposium (in Catalan). Barcelona: Institut d’Estudis Catalans.
3. Beigbeder, Y. (1994). International Monitoring of Plebiscites, Referenda and National Elections: Self-determination and Transition to Democracy. Dordrecht: Martinus Nijhoff.
4. Carr, E. H. (1961). What Is History? London: Macmillan.
5. Cassese, A. (1995). Self-Determination of the Peoples: A Legal Reappraisal. Cambridge: Cambridge University Press.