KALVĀNS, Ēriks. Options of Using Oxford Happiness Survey of Latgale Inhabitants Happiness Structural Studies. SOCIETY. INTEGRATION. EDUCATION. Proceedings of the International Scientific Conference, Rezekne, Latvia, v. 3, p. 369–378, 2015. DOI: 10.17770/sie2015vol3.368. Disponível em: https://journals.ru.lv/index.php/SIE/article/view/368.. Acesso em: 4 may. 2024.