1. Eurostat,http://ec.europa.eu/eurostat/statisticsexplained/index.php/Labour_market_and_Labour_force_survey_(LFS)_statistics, 2015
2. Workplace health promotion for older workers: a systematic literature review;A Poscia,2016
3. Ilmarinen J, Ilmarinen V. Work ability and aging. In Finkelstein LM, Truxillo DM, Fraccaroli F, Kanfer R editors. Multi-age workforce, a use inspired approach. SIOP 2015, Routledge
4. Workload and individual factors affecting work ability among aging municipal employees;K Tuomi;Scand J Work Environ Health,1991
5. Changes in the work ability of active employees over 11-years period;J Ilmarinen;Scand J Work Environ Health,1997