van der Walt, B. J. “The Philosophy of D.H.Th. Vollenhoven (1892 - 1978) – With Special Reference to His Historiography of Philosophy”. Tydskrif Vir Christelike Wetenskap | Journal for Christian Scholarship, vol. 42, no. 1 - 2, Jan. 2006, pp. 35-59, https://pubs.ufs.ac.za/index.php/tcw/article/view/63.