Hermawan, Hengki, and Tjeri Hadrillah. “PENGARUH GROSS PROFIT MARGIN OPERATING PROFIT MARGIN NET PROFIT MARGIN TERHADAP HARGA SAHAM”. PROSIDING SENANTIAS: Seminar Nasional Hasil Penelitian Dan Pengabdian Kepada Masyarakat, vol. 4, no. 1, July 2023, pp. 1134-43, https://openjournal.unpam.ac.id/index.php/Senan/article/view/33847.