1. Ahmad, S. and Wahid, H. (2005), “Penerimaan dan Tanggapan Masyarakat terhadap Sumber Harta Zakat Harta yang Diikhtilaf (“Acceptence towards the unconcensus Zakat sources”)”,Islamiyyat, Vol. 27 No. 1, pp. 45‐65.
2. Ahmad, S., Wahid, H. and Mohamad, A. (2006), “Penswastaan Institusi Zakat dan Kesannya Terhadap Pembayaran Secara Formal di Malaysia (“Privatization of Zakat institutions in Malaysia and its effect on formal payment”)”,International Journal of Management Studies, Vol. 13 No. 2, pp. 175‐96.
3. Department of Statistics Malaysia (2010),Population Distribution and Basic Demographic Characteristics, available at: www.statistics.gov.my/portal/download_Population/files/census2010/Taburan_Penduduk_dan_Ciri‐ciri_Asas_Demografi.pdf (accessed April 24, 2011).
4. Fare, R., Grosskopf, S., Norris, M. and Zhang, Z. (1994), “Productivity growth, technical progress, and efficiency change in industrialized countries”,The American Economic Review, Vol. 84 No. 1, pp. 66‐83.
5. Husain, N., Abdullah, M. and Kuman, S. (2000), “Evaluating public sector efficiency with data envelopment analysis (DEA): a case study in Road Transport Department, Selangor, Malaysia”,Total Quality Management, Vol. 44, p. 4‐6.