1. Fernández-Ballesteros, R., Schroots, J.J.F. & Rudinger, G. (1995). EuGeron: Aging, health and competence. Report 2: Protocol. Amsterdam: ERGO/University of Amsterdam.
2. Rudinger, G., Fernández-Ballesteros, R. & Schroots, J.J.F. (1996). EuGeron: Aging, health and competence. Report 3: Sampling. Amsterdam: ERGO/University of Amsterdam.
3. Schroots, J.J.F., Fernández-Ballesteros, R. & Rudinger, G. (1995). EuGeron: Aging, health and competence. Report 1: Rationale and concepts. Amsterdam: ERGO/University of Amsterdam.