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Wahyuni, Nunung Sri, University of Muhammadiyah Sumatera Utara (Indonesia)
Wakhyuni, Emi, Pembangunan Panca Budi University (Indonesia)
Wasesa, Supar, Islamic University of North Sumatra (Indonesia)
Wira, Henny, Post-graduate Program University of Muhammadiyah Sumatera Utara (Indonesia)
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