Szostak D. Planning the Fishing Service Tourism Product Development Based on Endogenous Values. Example of the Szczecinek County (Poland). Prace KGP PTG [Internet]. 2020 Sep. 28 [cited 2024 Nov. 21];34(3):22-35. Available from: https://prace-kgp.uken.krakow.pl/article/view/7406