Pebrianti, Yulia. 2019. “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 4 (2). https://doi.org/https://doi.org/10.19109/ifinance.v4i2.2640.