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Page 1: Welcome to Digital Repository Universitas Negeri Medan - Digital …digilib.unimed.ac.id/29250/2/reviewer.pdf · 2018. 4. 18. · htt :// Tournal/index. h /elt/issue/view/ Scopus
Page 2: Welcome to Digital Repository Universitas Negeri Medan - Digital …digilib.unimed.ac.id/29250/2/reviewer.pdf · 2018. 4. 18. · htt :// Tournal/index. h /elt/issue/view/ Scopus