Barnes-Farrell JL, Piotrowski MJ, 1991, Discrepancies between chronological age and personal age as a reflection of unrelieved worker stress. Work & Stress, 3, 177-187.
Bugajska J, Makowiec-Dąbrowska T, Jegier A, Marszałek A, 2005, Physical work capacity (VO- 2max) and work ability (WAI) of active employees (men and women) in Poland, [in:] Costa G, Goedhard WJA, Ilmarinen J (eds.), Assessment of work ability, health and well-being of ageing workers. International Congress Series 1280, Elsevier, London, 156-160.
Costa G, Sartori B, Ramalho F, Paes Duarte A, 2005, Work ability in health care workers, [in:] Costa G, Goedhard WJA, Ilmarinen J (eds.), Assessment of uork ability, health and well-being of ageing workers. International Congress Series 1280, Elsevier, London, 264-269.
Ilmarinen J, Tuomi K, Seitsamo J, 2005, New dimensions of work ability, [in:] Costa G, Goedhard WJA, Ilmarinen J (eds.), Assessment of work ability, health and well-being of ageing workers. International Congress Series 1280, Elsevier, London, 3-7.
Tuomi K, Ilmarinen J, Jahkola A, Katajarinne L, Tulkki A, 1998, Work Ability Index. Finnish Institute of Occupational Health, Helsinki.
Weiss DJ, Davis RV, England GW, Lofquist CH, 1967, Manual for the Minnesota Satisfaction Questionnaire. Industrial Relations Center, University of Minnesota.