Nze, I. C. ., Ogwude, I. C. ., Nnadi, K. U. ., & Ibe, C. C. . (2016). Modelling the Relationship between Demand for River Port Services and Vessel Supply Costs: Empirical Evidence from Nigeria. Global Journal of Social Sciences Studies, 2(3), 144–149. https://doi.org/10.20448/807.2.3.144.149