Tjitrohartoko, O. S., and T. G. Saraswati. “Applying Importance Performance Analysis to Assess Customer Satisfaction: Mass Rapid Transportation in Indonesia”. International Journal of Management, Entrepreneurship, Social Science and Humanities, vol. 3, no. 1, June 2020, pp. 16-23, doi:10.31098/ijmesh.v3i1.138.