Salifu-Asubay, E. K., and C. Adjei Mensah. “Improving Delivery of Construction Projects in Ghana’s Cities: A Lean Construction Approach”. International Journal of Sustainable Construction Engineering and Technology, Vol. 6, no. 1, Jan. 2015, pp. 1-15, https://publisher.uthm.edu.my/ojs/index.php/IJSCET/article/view/993.