OLSON, Kenneth S.; MBIRI KOOGIBHO, David. Labial vibrants in Mangbetu. AAeO - Afrikanistik-Aegyptologie-Online, [S. l.], 2013. DOI: 10.18716/ojs/aaeo/2013_3396. Disponível em: https://journals.ub.uni-koeln.de/index.php/AAeo/article/view/3396. Acesso em: 7 may. 2026.