1. Bryant, A., Schönemann, N. & Karpa, D. (2011): Integrating Service Learning into the University Classroom. Sudbury, MA: Jones and Bartlett Publishers.
2. Catholic University of Avila. (2015). Declaration of Identity. Retrieved from: https://www.ucavila.es/index.php?option=com_content&view=article&id=1178&Itemid=236&lang=en.
3. Service-learning: Thinking outside the box;Deeley;Active Learning in Higher Education,2010
4. Intergenerational Education Programs in Leisure and Aging Courses: Older Adult and Student Experiences;Dupuis;SCHOLE: A Journal of Leisure Studies and Recreation Education,2002
5. Francis I (2015). Encyclical Letter Laudato Si’ of the Holy Father Francis on care for our common home. Rome: Vatican Press.