Kamaluddin Galingging https://scholar.google.com/citations?user=fY-us5YAAAAJ&hl=id&oi=ao Universitas HKBP Nommensen Medan Indonesia
Junita Batubara http://sinta.kemdikbud.go.id/author/?mod=profile&p=stat Universitas HKBP Nommensen Medan Indonesia
Tulus Marbun Universitas HKBP Nommensen Medan Indonesia
Juliaster Marbun https://scholar.google.com/citations?user=v96sdLYAAAAJ&hl=id&oi=ao Universitas HKBP Nommensen Medan Indonesia
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