Addai-Asante, Johnson, et al. “Firm Level Technical Efficiency Between Foreign-Owned and Domestic-Owned Firms: Case Study of Pharmaceutical Manufacturing Industry in Ghana”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 36, no. 1, Oct. 2017, pp. 146-6, https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/2860.