Comparative Study of Electoral Systems (CSES) Questionnaires
- Module 6 (1996-2001) [text file]
- Module 5 (2016-2021) [text file]
- Module 4 (2011-2016) [PDF file]
- Module 3 (2006-2011) [PDF file]
- Module 2 (2001-2006) [text file]
- Module 1 (1996-2001) [PDF file]