Purnama, Chamdan, and Waspodo Tjipto Subroto. “Competition Intensity, Uncertainty Environmental on the Use of Information Technology and Its Impact on Business Performance Small and Medium Enterprises (SMEs)”. International Review of Management and Marketing, vol. 6, no. 4, Oct. 2016, pp. 984-92, https://econjournals.com/index.php/irmm/article/view/3294.