Izquieta Etulain, José Luis, and José Javier Callejo González. “Associationism Ans Participation in Volunteer Activities Among Spanish Young: Changes and Current Trends”. Cuadernos de Trabajo Social, vol. 26, no. 1, Mar. 2013, pp. 159-70, https://doi.org/10.5209/rev_CUTS.2013.v26.n1.39253.