1. Department of Pedagogy, Psychology, Philosophy, University of Cagliari, 09123 Cagliari, Italy
2. Department of Educational and Social Policy, University of Macedonia, 54636 Thessaloniki, Greece
3. Department of Literature, Languages and Cultural Heritage, University of Cagliari, 09123 Cagliari, Italy
4. Instituto de Educação, University of Lisboa, 1649-013 Lisboa, Portugal