FOCUS AND SCOPE
PEER REVIEW
PUBLICATION ETHICS
OPEN ACCESS POLICY
PLAGIARISM
INDEXING
RIGHTS AND LICENSES
AUTHOR GUIDELINES
AUTHOR FEES
REVIEWER
VISITOR STATISTICS
The author's countries are coming from Malaysia (Universiti Teknologi Malaysia) Indonesia (Universitas Muhammadiyah Sumatera Utara, Universitas Pancasila, Universitas Padjajaran, Universitas Sumatera Utara)
