Ernšteins, Raimonds, Diāna Šulga, Daiga Štelmahere, and Sarmīte Grundšteina. “MUNICIPAL ENVIRONMENTAL MANAGEMENT AND SUSTAINABLE DEVELOPMENT: INTEGRATION AND SYSTEMIZATION PRACTICE FOR FURTHER EDUCATION”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 23, 2007): 285–294. Accessed May 6, 2024. https://journals.rta.lv/index.php/ETR/article/view/1718.