Retief, F. and Coetzee, P. (2018) “Owren se siekte (Kongenitale faktor V-tekort, parahemofilie) by twee kleurlingsusters”, South African Medical Journal, 38(7), pp. 544–547. Available at: https://www.ajol.info/index.php/samj/article/view/181041 (Accessed: 18 August 2026).