Jarosz-Angowska, A., and M. Angowski. “THE IMPORTANCE OF THE SMALL AND MEDIUM-SIZED ENTERPRISE SECTOR OF THE VOIVODESHIPS OF EASTERN POLAND”. Acta Scientiarum Polonorum. Oeconomia, Vol. 13, no. 4, Dec. 2014, pp. 67-78, https://js.wne.sggw.pl/index.php/aspe/article/view/4143.