Zajadacz , Alina, Ewa Stroik, and Joanna Śniadek. “The Problem of Ensuring the Quality of Services in Tourist Destinations. French, Spanish and German Solutions”. Studia Oeconomica Posnaniensia 6, no. 10 (October 31, 2018): 188–210. Accessed September 3, 2026. https://journals.ue.poznan.pl/soep/article/view/3878.