ZYDROŃ, Adam; PRUCHLAT, Olga. Determination of the Social Value of the National Park Travel Cost Method. Regional Barometer. Analyses & Prognoses, [S. l.], v. 12, n. 4, p. 155–164, 2015. DOI: 10.56583/br.993. Disponível em: https://czaz.akademiazamojska.edu.pl/index.php/br/article/view/993. Acesso em: 19 apr. 2025.