1. Baars J., Thomese F., 1994. Communes of elderly people: Between independence and colonization. Journal of Aging Studies8:341-356.
2. Habermas J., 1984. The theory of communicative action (2 vols.) Heinemann, London.
3. Kohli M., Rein M., Guillemard A.-M., Van Gunsteren H., , ed.Time for retirement: Comparative studies of early exit from the labour force1991Cambridge University Press, Cambridge, England.