APA-referens (7:e uppl.)
van der Walt, B. (1978). Heartbeat: Taking the pilse of our christian theological and philosophical heritage. Potchefstroom University for Christian Higher Education.
Chicago-referens (17:e uppl.)
van der Walt, B.J. Heartbeat: Taking the Pilse of Our Christian Theological and Philosophical Heritage. Potchefstroom: Potchefstroom University for Christian Higher Education, 1978.
MLA-referens (9:e uppl.)
van der Walt, B.J. Heartbeat: Taking the Pilse of Our Christian Theological and Philosophical Heritage. Potchefstroom University for Christian Higher Education, 1978.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.