Gerald, B. and Patson, T.F. (2018) “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, 49(1), pp. 106–117. Available at: https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/4406 (Accessed: 17 September 2025).