„Arend Lijphart“. Department of Political Science, University of California at San Diego. 2008-yil 16-mayda asl nusxadan arxivlangan. Qaraldi: 2008-yil 22-avgust.
„Arend Lijphart“. Department of Political Science, University of California at San Diego. 2008-yil 16-mayda asl nusxadan arxivlangan. Qaraldi: 2008-yil 22-avgust.