1. Armstrong, N. (2012). Historypin: Bringing generations together around a communal history of time and place. Journal of Intergenerational Relationships, 10(3), 294–298. doi: 10.1080/15350770.2012.697412 .
2. Balcazar, F. E., & Keys, C. B. (2014). Goals in mentoring relationships. In D. L. Dubois & M. J. Karcher (Eds.), Handbook of youth mentoring (2nd ed., pp. 83–98). Thousand Oaks, CA: Sage.
3. Bateson, M. C. (2010). Composing a further life. The age of active wisdom. New York: Knopf.
4. Bauman, Z. (2007). Entre nosotros, las generaciones. [Among us, generation] In J. Larrosa (Ed.), Entre nosotros. Sobre la convivencia entre generaciones [Among us. About intergenerational co-living] (pp. 101–127). Barcelona: Fundació Viure i Conviure.
5. Biesta, G. (2011). Education, lifelong learning, and the politics of citizenship. Rotterdam: Sense Publishers. Learning democracy in school and society.