Balsells, A. et al. (2011) „Needs Analysis for a Parental Guidance Program for Biological Family: Spain’s Current Situation”, Revista de Cercetare si Interventie Sociala, 34, pp. 21–37. Disponibil la: https://www.rcis.ro/journal/article/view/376-needs-analysis-for-a-parental-guidance-program-for (Data accesării: 6 noiembrie 2026).