Biernat-Jarka, A., and E. Grzymska. “THE LEVEL OF INNOVATIVENESS IN POLAND ON THE EXAMPLE OF ENTERPRISES FROM THE WARMIŃSKO-MAZURSKIE VOIVODSHIP”. Acta Scientiarum Polonorum. Oeconomia, Vol. 7, no. 1, Mar. 2008, pp. 5-14, https://js.wne.sggw.pl/index.php/aspe/article/view/3759.