1. Asandului, L. (2013). Population Aging in Romania: Facts and Analysis. Retrieved 12.08.2015 from http://msed.vse.cz/files/2012/Asandului_2012.pdf
2. Barry, C. A., Stevenson, F. A., Britten, N., Barber, N., & Bradley, C. P. (2001). Giving voice to the lifeworld. More humane, more effective medical care? A qualitative study of doctor–patient communication in general practice. Social Science & Medicine, 53(4), 487–505. doi: 10.1016/s0277-9536(00)00351-8 .
3. Bryant, L. L., Corbett, K. K., & Kutner, J. S. (2001). In their own words: a model of healthy aging. Social Science & Medicine, 53(7), 927–941. doi: 10.1016/s0277-9536(00)00392-0 .
4. Charmaz, K. (2003). Grounded Theory. Objectivist and Constructivist Methods. In N. R. Denzin, & Y. S. Lincoln (Eds.), Strategies of Qualitative Inquiry (pp. 249–291). Thousand Oaks, Ca: Sage.
5. Charmaz, K. (2005). Grounded Theory in the 21st Century. Applications for Advancing Social Justice Studies. In N. R. Denzin, & Y. S. Lincoln (Eds.), Handbook of Qualitative Research (pp. 507–535). Thousand Oaks, Ca: Sage.