Michalska-Dudek, Izabela, and Andrzej Rapacz. “The Loyalty Measurement Problems of Travel Agencies’ Customers in Poland”. Studia Oeconomica Posnaniensia 5, no. 4 (April 30, 2017): 242–264. Accessed September 3, 2026. https://journals.ue.poznan.pl/soep/article/view/3425.