1. Almeida, T., Hatton-Yeo, A., Marreel, I., Waser, M., Limacher, & Duaigües, M., et al. (2009). Guide of ideas for planning and implementing intergenerational projects. Together: Yesterday, today and tomorrow. Estonia: Rääma Young People Union Youth.
2. Biggs, S., & Lowenstein, A. (2011). Generational intelligence. A critical approach to age relations. London: Routledge.
3. Börsch-Supan, A. (2015). Challenges for European Welfare States (MEA Discussion Papers No. 08-15). Retrieved from http://mea.mpisoc.mpg.de/uploads/user_mea_discussionpapers/1658_08-2015.pdf
4. Börsch-Supan, A., & Weiss, M. (2013). Productivity and age: Evidence from work teams at the assembly line (MEA Discussion Papers No. 148-2007). Retrieved from http://mea.mpisoc.mpg.de/uploads/user_mea_discussionpapers/1057_148-07.pdf
5. Cadiz, D. M., Truxillo, D. M., & Fraccaroli, F. (2015). What are the benefits of focusing on generation-based differences and at what cost? Industrial and Organizational Psychology, 8(3), 356–362. doi: 10.1017/iop.2015.49 .