Wan Ahmad, Wan Ibrahim, and Zainab Ismail. 2010. “Tahap Penghayatan Agama Warga Tua : Pengukuran Dan Persoalan Metodologi”. Al-Hikmah 2 (January), 161-80. http://spaj.ukm.my/jalhikmah/index.php/jalhikmah/article/view/60.