Huda, M. K., N. Nugraheni, and K. Kamarudin. “Profit Sharing Contract on Oil and Gas Pursuant to Act Number 22 Year 2001”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 14, no. 3, Nov. 2015, pp. 1-15, https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/1073.