Report copyright - Volume 06 Nomor 01 Jull 2017 - digilib.unimed.ac.iddigilib.unimed.ac.id/28140/1/Fulltext.pdf · Dr. Mhd. Yusuf Harahap, M.Si (Universitas Negeri Medan) Dr. Fitra Waty, M.Si (Universitas
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