Nwangwu, George. “A Comparative Analysis of the Use of Unsolicited Proposal for the Delivery of Public-Private Partnership Projects in Africa”. Journal of Sustainable Development Law and Policy 10, no. 2 (February 3, 2020): 207–226. Accessed March 23, 2026. https://jsdlp.ogeesinstitute.edu.ng/jsdlp/article/view/161.