GERALD, Banda; PATSON, Tailoka Frank. An Investigation on the Relationship between the Level of Education and Monthly Income: A Case of Kitwe District of Zambia. American Scientific Research Journal for Engineering, Technology, and Sciences, Jordan, v. 49, n. 1, p. 106–117, 2018. Disponível em: https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/4406. Acesso em: 17 sep. 2025.