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Pebrianti Y. PENGARUH OPERATING EXPENSES DAN SALES TERHADAP NET PROFIT MARGIN (NPM) PADA PERUSAHAAN SEKTOR PARIWISATA BURSA EFEK INDONESIA PERIODE 2012-2016. I-Finance: a Research Journal on Islamic Finance [Internet]. 28Jan.2019 [cited 17Sep.2019];4(2). Available from: http://jurnal.radenfatah.ac.id/index.php/I-Finance/article/view/2640