Strauss, D. F. M. “The Problem of Continuity and Discontinuity With Special Reference to Modern Biology I”. Tydskrif Vir Christelike Wetenskap | Journal for Christian Scholarship, vol. 46, no. 3 - 4, Dec. 2010, pp. 17-33, https://pubs.ufs.ac.za/index.php/tcw/article/view/218.