Zontek, Zbigniew, and Ewa Lipianin-Zontek. “INNOVATION STRATEGIES AND COOPERATION FOR REGIONAL TOURISM DEVELOPMENT”. Acta Scientiarum Polonorum. Oeconomia 9, no. 4 (December 30, 2010): 669–677. Accessed April 24, 2024. https://aspe.sggw.edu.pl/article/view/655.