Zawilińska, Bernadetta. “The Economic Value of Protected Areas - An Outline of the Issues and Research Methodology”. Krakow Review of Economics and Management/Zeszyty Naukowe Uniwersytetu Ekonomicznego w Krakowie, no. 12(936) (December 4, 2015): 113–129. Accessed September 20, 2024. https://aoc.uek.krakow.pl/index.php/krem/article/view/677.