van der Walt, B. J. 2007. “The Clash of Cultures How to Explain and Evaluate Cultural Differences from a Reformational-Christian Perspective”. Tydskrif Vir Christelike Wetenskap | Journal for Christian Scholarship 43 (1 - 2):137-61. https://pubs.ufs.ac.za/index.php/tcw/article/view/122.