1. Bartolini, Stefano (1984) ‘Sistema partitico ed elezione diretta del capo dello stato in Europa,’ Rivista Italiana di Scienza Politico, 14, 2: 223–43.
2. Boix, Charles (1999) ‘Setting the Rules of the Game: the Choice of Electoral Systems in Advanced Democracies,’ American Political Science Review, 93: 609–24.
3. Caramani, Daniele (2000) Elections in Western Europe since 1815. London: Macmillan — now Palgrave Macmillan.
4. Carstairs, Andrew McLaren (1980) A Short History of Electoral Systems in Western Europe. London: George Allen & Unwin.
5. Cole, Alistair and Peter Campbell (1989) French Electoral Systems and Elections since 1789. Aldershot: Gower.