Zawojska, E., Z. Szkop, M. Czajkowski, and T. Żylicz. “ECONOMIC VALUATION OF ECOSYSTEM SERVICES PROVIDED BY THE WILANÓW PARK. A BENEFIT TRANSFER STUDY”. Economics and Environment, vol. 59, no. 4, Oct. 2016, p. 11, https://www.ekonomiaisrodowisko.pl/journal/article/view/207.