Abdul Rohman, M., and A. Z. S. Ahmad Sabri. “SISTEM KAD PERAKAM WAKTU (KPW) ERA KEPIMPINAN TUN DR MAHATHIR MOHAMAD DI MALAYSIA”. Al-Hikmah, Vol. 8, no. 2, Dec. 2016, pp. 166-83, https://spaj.ukm.my/jalhikmah/index.php/jalhikmah/article/view/210.