"Groundwater Resources of Swaziland"(PDF). Swaziland Ministry of Natural Resources, Land Use and Energy. December 1992. p. 7. Archived(PDF) from the original on 23 October 2016. Retrieved 22 October 2016.
"Groundwater Resources of Swaziland"(PDF). Swaziland Ministry of Natural Resources, Land Use and Energy. December 1992. p. 7. Archived(PDF) from the original on 23 October 2016. Retrieved 22 October 2016.