Grietiņa, Ilze, and Ivars Matisovs. “NATURE FRIENDLY TOURISM AND DEVELOPMENT OF TRAILER PARKS IN LATVIA”. HUMAN. ENVIRONMENT. TECHNOLOGIES. Proceedings of the Students International Scientific and Practical Conference, no. 24 (April 22, 2020): 135–139. Accessed May 17, 2024. https://journals.ru.lv/index.php/HET/article/view/6764.