Indexed By
Nurzainah Ginting, University of Sumatera Utara, Indonesia
Galih Ari Wirawan Siregar, Universitas Sumatera Utara, Indonesia
This work is licensed under a Creative Commons Attribution 3.0 License.
Nurzainah Ginting, University of Sumatera Utara, Indonesia
Galih Ari Wirawan Siregar, Universitas Sumatera Utara, Indonesia
This work is licensed under a Creative Commons Attribution 3.0 License.