ngatno sitompul
INDEXED BY:
This work is licensed under a Creative Commons Attribution 4.0 International License.
CSRID Journal Editor's Office:
Universitas Potensi Utama. Jl. K.L. Yos Sudarso Km 6,5 No.3-A Telp. (061) 6640525 Ext. 214 Tanjung Mulia Medan 20241