Zmyślony , Piotr, and Dawid Szutowski. “Measuring the Long-Term Effectiveness of City Tourism Sales Promotion”. Studia Oeconomica Posnaniensia 2, no. 1 (January 31, 2014): 134–151. Accessed September 3, 2026. https://journals.ue.poznan.pl/soep/article/view/3168.