INDEXED BY :
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Publisher:
LPPM Universitas Labuhanbatu
Editorial Address:
Jln.S.M. Raja No.126 A Aek Tapa Rantauprapat, Kab. Labuhanbatu Sumatera Utara, Indonesia
This work is licensed under a Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)