Tempelhoff, J W N2012-08-152012-08-152011Tempelhoff, J.W.N. 2011. Editorial comment: tribute to prof. Pieter de Klerk. TD The Journal for Transdisciplinary Research in Southern Africa, 7(2):iii-xxvii, Dec. [http://dspace.nwu.ac.za/handle/10394/3605]1817-4434http://hdl.handle.net/10394/6899otherArticle