LÜLL, M. WLB in Zahlen 2017. WLBforum, Stuttgart, v. 20, n. 1, p. 21, 2021. DOI: 10.53458/wlbf.v20i1.144. Disponível em: https://journals.wlb-stuttgart.de/ojs/index.php/wlbf/article/view/144. Acesso em: 27 jan. 2022.