NGWARE, N. M. “Solid Waste Management in Dar Es Salaam City: Understanding Roles, Levels and Collaboration Among Stakeholders”. The Journal of Building and Land Development, vol. 18, no. 1 & 2, Aug. 2018, pp. 107-24, http://journals.aru.ac.tz/index.php/JBLD/article/view/210.