Firmansyah, Egi Arvian, et al. “Analisis Return on Equity (RoE) Dan Price Earning Ratio (PER) Terhadap Return Saham Sektor Pertambangan Di Bursa Efek Indonesia”. Jurnal Abmas, vol. 9, no. 1, Oct. 2009, pp. 1-12, https://doi.org/10.17509/abmas.v9i1.92.