Facts, Values and Ethics: A
confrontation with twentieth century British moral philosophy in particular G.
E. Moore (Second
edition, Assen: Van Gorcum, 1969)
Chapter 1 [pdf]
Chapter 6 [pdf]
Chapter 7 [pdf]
On Worldviews [pdf] Christian Scholar's Review XIV (2): 153-164.
Also in Stained Glass: Worldviews and Social Science (ed.) Paul Marshall, Sander Griffioen and Richard Mouw. University Press of America, Lanham MD, 1989: 26-40.
The word of God and biblical authority [pdf]
Potchefstroom: Wetenskappelike Bydraes van die Potchefstroom Universiteit vir Christelike Hoger Onderwys, 1976.
The word of God and creation [pdf] AACS Academic papers, 1975.
Also published in Tydskrif vir Christelike Wetenskap 25 (1989): 25-37; and Christian Scholar's Review XXI (3) : 231-48.
Values and valuation [pdf] Philosophia Reformata 32 (1) (1967): 37-54.