Penulis Adelina Simanungkalit Agus T. Poputra Treesje Runtu DOI: https://doi.org/10.32400/gc.10.4.10514.2015 Abstrak Unduhan PDF (English) Diterbitkan 2015-12-31 Terbitan Vol 10 No 4 (2015) Bagian Articles Lisensi Author keep the copyright of the article published in this journal