Isa, R. B., and D. M. Abeku. 2019. “Procurement Systems and Contract Pricing Methodsin the Construction Industry: Perspective of Contractors in Kaduna Metropolis, Nigeria”. International Journal of Creativity and Technical Development (IJCTD) 3 (2):1-12. http://icidr.org.ng/index.php/Ijctd/article/view/712.