1Gardner, J. W. (1987): Leadership Development: Leadership Papers, Washington DC.: Independent Sector.
2Josephine A. van Linden & Carl I. Fertman (1998): Youth Leadership: A Guide to Understanding Leadership Development in Adolescents, San Francisco: Jossey-Bass Inc., Publishers.
3Richard M. Lerner & Peter L. Benson (2003): Developmental Assets and Asset-Building Communities, Kluwer Academic/Plenum Publishers.