1. Faculty of Economics, University of Zawia, Zawia, P.O. Box 16418, Libya
2. UKM-Graduate School of Business, Faculty of Economics and Management, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia
3. Universitas Sebelas Maret, Jalan Ir. Sutami 36 Kentingan Jebres, Surakarta 57126, Jawa Tengah, Indonesia