1. UNFPA.: Ageing in the Twenty-First Century: A celebration and A challenge. United Nations Population Fund (UNFPA), New York (2012)
2. Brouwer, W.B.F., van Exel, N.J.A., van de Berg, B., Dinant, H.J., Koopmanschap, M.A., van den Bos, G.A.M.: Burden of caregiving: evidence of objective burden, subjective burden, and quality of life impacts on informal caregivers of patients with rheumatoid arthritis. Arthritis Care Res. 51(4), 570–577 (2004)
3. Chwalisz, K., Kisler, V.: Perceive stress: a better measure of carer burden. Measur. Eval. Couns. Dev. 28, 88–98 (1995)
4. Schneider, U., Trukeschitz, B., Mühlmann, R., Jung, R., Ponocny, I., Katzlinger, M., Österle, A.: Wiener Studie zur informellen Pflege und Betreuung älterer Menschen 2008 (Vienna Informal Carer Study - VIC2008) Wirtschaftsuniversität Wien, Forschungsinstitut für Altersökonomie, p. 98 (2009)
5. Coon, D., Evans, B.: Empirically based treatments for family carers distress: what works and where do we go from hear. Geriatr. Nurs. 30(6), 426–436 (2009)