SILIŅĒVIČA, Irena. TŪRISMS, VIDE, APKĀRTĒJĀ SABIEDRĪBA. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 1, p. 177–179, 1999. DOI: 10.17770/etr1999vol1.1878. Disponível em: https://journals23.rta.lv/index.php/ETR/article/view/1878.. Acesso em: 17 apr. 2025.