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Abstract views : 266
DOI: https://doi.org/10.31845/jwk.v9i4.425
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Copyright (c) 2020 Muchtar Pakpahan
License URL: http://creativecommons.org/licenses/by-nc-sa/4.0
Abstract views : 266
DOI: https://doi.org/10.31845/jwk.v9i4.425
Copyright (c) 2020 Muchtar Pakpahan
License URL: http://creativecommons.org/licenses/by-nc-sa/4.0