NGALAWA, H. P. E. Anatomy Of The Southern African Customs Union: Structure And Revenue Volatility. International Business & Economics Research Journal (IBER), [S. l.], v. 13, n. 1, p. 145–156, 2014. DOI: 10.19030/iber.v13i1.8385. Disponível em: https://clutejournals.com/index.php/IBER/article/view/8385. Acesso em: 17 jul. 2024.