Sajidu et al. 2007. Sajidu, S.M.I.; Masamba, W.R.L.; Henry, E.M.T.; Kuyeli, S.M. (2007). "Water quality assessment in streams and wastewater treatment plants of Blantyre, Malawi". Physics and Chemistry of the Earth, Parts A/B/C. 32 (15–18): 1391–1398. Bibcode:2007PCE....32.1391S. doi:10.1016/j.pce.2007.07.045.
"Hanover – Twin Towns" (in German). Offizielles Portal der Landeshauptstadt und der Region Hannover in Zusammenarbeit mit hier.de. Archived from the original on 24 July 2011. Retrieved 17 July 2009.
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Sajidu et al. 2007. Sajidu, S.M.I.; Masamba, W.R.L.; Henry, E.M.T.; Kuyeli, S.M. (2007). "Water quality assessment in streams and wastewater treatment plants of Blantyre, Malawi". Physics and Chemistry of the Earth, Parts A/B/C. 32 (15–18): 1391–1398. Bibcode:2007PCE....32.1391S. doi:10.1016/j.pce.2007.07.045.
"Hanover – Twin Towns" (in German). Offizielles Portal der Landeshauptstadt und der Region Hannover in Zusammenarbeit mit hier.de. Archived from the original on 24 July 2011. Retrieved 17 July 2009.