Khan, I. ul H., and I. T. Siddique. “Chemical Extraction of Copper from Copper Sulphide Ores of Pakistan by Roast Leach Method: Copper Extraction from Copper Sulphide Ores”. Biological Sciences - PJSIR, vol. 53, no. 5, Oct. 2010, pp. 233-8, https://v2.pjsir.org/index.php/biological-sciences/article/view/469.