LÜLL, M. Die Benutzung 2014. WLBforum, Stuttgart, v. 17, n. 1, p. 52, 2015. DOI: 10.53458/wlbf.v17i1.287. Disponível em: https://journals.wlb-stuttgart.de/ojs/index.php/wlbf/article/view/287. Acesso em: 22 mai. 2022.