KALVĀNS, Ēriks. REAL HAPPINESS AS REALIZATION OF IMPORTANT VITAL VALUES AND RESEARCH OF ITS STRUCTURE IN LATGALE REGION. Education Reform in Comprehensive School: Education Content Research and Implementation Problems, Rezekne, Latvia, p. 5–13, 2017. DOI: 10.17770/ercs2017.2752. Disponível em: https://journals.rta.lv/index.php/PSPI/article/view/2752.. Acesso em: 3 jan. 2025.