Gotowski, R., K. Parzych, W. Karczewska, and A. Gotowska. “The Upper Notec and Goplo Lake Sailing Trail and Place of Water Tourism”. Journal of Education, Health and Sport, vol. 8, no. 6, June 2018, pp. 418-26, https://apcz.umk.pl/JEHS/article/view/6167.