Wawrzyniak, B., and B. Wojtasik. “CHANGES OF EDUCATION LEVEL OF RURAL POPULATION SINCE 1996 TO 2002”. Acta Scientiarum Polonorum. Oeconomia, Vol. 3, no. 2, Dec. 2004, pp. 139-47, https://js.wne.sggw.pl/index.php/aspe/article/view/3639.