Niewiadomska, Anna, and Ewa Sobolewska-Poniedziałek. 2016. “EDUCATIONAL ACTIVITY AS THE GROWTH FACTOR OF PROFESSIONAL ACTIVITY OF ELDERLY PEOPLE”. Acta Scientiarum Polonorum. Oeconomia 15 (3), 79-90. https://js.wne.sggw.pl/index.php/aspe/article/view/4243.