Mujani, W. K., and A. Kasri. “MUSLIM KELAS MENENGAH DI MALAYSIA: DEFINISI SERTA SUMBANGAN DALAM BIDANG EKONOMI DAN POLITIK (Middle Class Muslim in Malaysia : Definition and Their Contributions to Economics and Politics)”. Journal of Al-Tamaddun, vol. 7, no. 2, Dec. 2012, pp. 1-39, http://adum.um.edu.my/index.php/JAT/article/view/8637.