1. Abs, H. J. (2008). Critical incidents in citizenship learning. Paper presented at the ECER 2008 Conference at the University of Gothenburg.
2. Abs, H. J. (Ed.) (2009). Introducing quality assurance in education for democratic citizenship. Comparative study of 10 countries. Strasbourg (Council of Europe Publishing).
3. Bennett, M. J. (1993). Towards ethnorelativism: A developmental model of intercultural sensitivity. In: M. R. Paige (Ed.), Education for the intercultural experience (pp. 21-71). Yarmouth, MN: Intercultural Press.
4. Social behaviour and applications;JW Berry,1997
5. Bîrzéa, C. (Ed.) (2004). All-European study on education for democratic citizenship policies. Strasbourg: Council of Europe.