Grietiņa, I. and Matisovs, I. 2020. NATURE FRIENDLY TOURISM AND DEVELOPMENT OF TRAILER PARKS IN LATVIA. HUMAN. ENVIRONMENT. TECHNOLOGIES. Proceedings of the Students International Scientific and Practical Conference. 24 (Apr. 2020), 135–139. DOI:https://doi.org/10.17770/het2020.24.6764.