1. Graduate School of Business, Universiti Sains Malaysia, Pulau Pinang, Malaysia
2. Department of Business Administration, Faculty of Administrative Science, Hadhramout University, Al Mukalla, Yemen
3. Department of Marketing and Production, Faculty of Administrative Science, Thamar University, Thamar, Yemen
4. Department of Business Administration, Faculty of Administrative and Financial Science, Arab American University, Jenin, Palestine
5. Department of Tourism and Hotel Management, Umm Al Qura University, Makkah, Saudi Arabia