Zydroń, A. ., Kayzer, D., Szoszkiewicz, K., & Iwiński, M. (2017). CONTINGENT VALUATION OF THE WIELKOPOLSKA NATIONAL PARK BY RESPONDENDS OF DIFFERENTIATED AGE AND EDUCATION. Economics and Environment, 60(1), 10. Retrieved from https://www.ekonomiaisrodowisko.pl/journal/article/view/244