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Mahyudin Ritonga
http://webmail.umsb.ac.id/
Muhammadiyah University west Sumatera
Indonesia
Menulis untuk Berbagi
Apri Wardana Ritonga
As-Syifa Qur'an College of Subang, West Java, Indonesia
Indonesia
Sri Wahyuni
Universitas Muhammadiyah Sumatera Barat
Indonesia
Julhadi Julhadi
Universitas Muhammadiyah Sumatera Barat
Indonesia