Reviewer
1. Prof. Dr. Zuhaimy Ismail, Universiti Teknologi Malaysia, Malaysia.
2. Prof. Milagros R. Baldemor, Ph.D, Don Mariano Marcos Memorial State University, Philippines.
3. Prof. Gerhard Wilhelm Weber, Ph.D, Poznan University of Technology, Poland.
4. Prof. Dr. Herman Mawengkang, Universitas Sumatera Utara.
5. Prof. Dr. Edi Syahputra M.Pd, Universitas Negeri Medan, Indonesia.
6. Adewoye Olabode Sunkanmi, Ph.D, Yabatech Collage of Technology, Nigeria.
7. Dr. Zainal Azis MM., M.Si, Universitas Muhammadiyah Sumatera Utara, Indonesia.
8. Dr. Marah Doly Nasution, M.Si, Universitas Muhammadiyah Sumatera Utara, Indonesia.
9. Dr. Asrin Lubis, M.Pd, Universitas Negeri Medan, Indonesia.
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