Siliņēviča, Irena. “TŪRISMS, VIDE, APKĀRTĒJĀ SABIEDRĪBA”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 20, 1999): 177–179. Accessed May 1, 2024. https://journals.ru.lv/index.php/ETR/article/view/1878.