CBOS (2012) Heroes or Informers? What Poles think of those who reveal problems in the workplace. Quantitative Research. Warsaw: April, 2012.
This study is only available in the Polish Language. It was commissioned by the Stefan Batory Foundation and conducted by Foundation for Public Opinion Research Center (Fundacja Centrum Badania Opinii Społecznej), Poland. The total number of completed interviews were 1018.