1. Álvarez-Díaz, M., Saisana, M., Montalto, V., & Tacao Moura, C. (2018). Corruption perceptions index 2017 statistical assessment. European Commission JRC Technical Reports. https://publications.jrc.ec.europa.eu/repository/bitstream/JRC113251/jrc113251_jrc_audit_of_the_corruption_perceptions_index.pdf
2. Byrne, E. (2014). Contribution to “measuring corruption – A problem of methodology.”https://www.transparency.org.uk/measuring-corruption-discussion/
3. Heywood, P. (2015). Measuring corruption. Perspectives, critiques and limits. In P. Heywood (Ed.), Routledge handbook of political corruption (pp. 137–153). New York, NY: Routledge.
4. Heywood, P. (2016). The corruption perceptions index (CPI): The good, the bad and the ugly. British Academy Blog. https://www.thebritishacademy.ac.uk/blog/corruption-perceptions-index-cpi-good-bad-and-ugly
5. Hodess, R. & Heinrich, F. (2011). Measuring corruption. In A. Graycar (Ed.), Handbook of global research and practice in corruption (pp. 18–33). E. Elgar, Cheltenham, UK.