Kijek, T. “AN EMPIRICAL ANALYSIS OF THE RELATIONSHIP BETWEEN TECHNOLOGICAL AND MARKETING INNOVATIONS : A CASE OF POLISH MANUFACTURING FIRMS”. Acta Scientiarum Polonorum. Oeconomia, Vol. 12, no. 2, June 2013, pp. 15-25, https://js.wne.sggw.pl/index.php/aspe/article/view/4077.