1. Some of these older debates were reproduced in: Arend Lijphart, Parliamentary versus Presidential Government (Oxford University Press, 1992).
2. Giovanni Sartori, Comparative Constitutional Engineering (London: Macmillan, 1994).
3. Samuel P. Huntington, The Third Wave. Democratization in the Late Twentieth Century (Norman: University of Oklahoma Press, 1991), p. 16.