David Dewar,  The Relationship between Spatial Planning and Transportation Planning in Southern Africa and its Consequences for Human Settlement.   journal   = {International Journal of Transport and Vehicle Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2011, vol. 53(5). 241 - 246
    [viewed 27 January 2020]. Available from: https://publications.waset.org/pdf/4937.