Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Arend Lijphart, Electoral Systems and Party Systems. A Study of Twenty-seven Democracies, 1945–1900, Oxford, Oxford University Press, 1994, pp. XVIII–203.
Ronald Inglehart, Modernization and Postmodernization. Cultural, Economic, and Political Change in 43 Societies, Princeton, Princeton University Press, 1997, pp. 453, $18.95, Isbn 0-691-01180-X (pb).