1. Airtel. {n. d.}. Airtel. http://www.africa.airtel.com/wps/wcm/connect/africarevamp/Zambia. ({n. d.}). visited June 2018. Airtel. {n. d.}. Airtel. http://www.africa.airtel.com/wps/wcm/connect/africarevamp/Zambia. ({n. d.}). visited June 2018.
2. ENAiKOON. {n. d.}. OpenCelliD. http://www.opencellid.org. ({n. d.}). visited July 2016. ENAiKOON. {n. d.}. OpenCelliD. http://www.opencellid.org. ({n. d.}). visited July 2016.
3. Glenn Fleishman. {n. d.}. How the iPhone knows where you are. http://www.macworld.com/article/1159528/smartphones/how-iphone-location-works.html. ({n. d.}). visited July 2017. Glenn Fleishman. {n. d.}. How the iPhone knows where you are. http://www.macworld.com/article/1159528/smartphones/how-iphone-location-works.html. ({n. d.}). visited July 2017.