Shammas, N. K., Wang, L. K. Water Engineering: Hydraulics, Distribution, and Treatment. Hoboken: Wiley, 2016. ISBN 978-0-470-39098-6.
Gray, N. F. Water technology: an introduction for environmental scientists and engineers. 2nd ed. Oxford: Elsevier Butterworth-Heinemann, 2005. ISBN 0-7506-6633-1.
Kroger, W., Zio, E. Vulnerable Systems, Springer, 2011. ISBN 978-0-85729-655-9 .
Ghebrekidan, A. Principles of Urban – Regional Planning and Development. University of Juba, 2018. ISBN: 9 789970 445851 .