Niewiadomska, A., and E. Sobolewska-Poniedziałek. “EDUCATIONAL ACTIVITY AS THE GROWTH FACTOR OF PROFESSIONAL ACTIVITY OF ELDERLY PEOPLE”. Acta Scientiarum Polonorum. Oeconomia, vol. 15, no. 3, Sept. 2016, pp. 79-90, https://aspe.sggw.edu.pl/article/view/375.