De Klerk, C J2012-02-152012-02-151981De Klerk, C.J. 1981. Die ontwikkeling van die Kasteel. Yesterday & today = Gister en vandag, 1:5-7, Apr. [http://www.sashtw.org.za/index2.htm] [http://dspace.nwu.ac.za/handle/10394/5126]2223-0386http://hdl.handle.net/10394/5519otherArticle