Ciptono, W. S. “Exploring the Linkages Between Deming’s Principle, World-Class Company, Operational Excellence, and Company Performance in an Oil and Gas Industry Setting”. Gadjah Mada International Journal of Business, Vol. 7, no. 2, May 2005, pp. 205-39, https://jurnal.ugm.ac.id/v3/gamaijb/article/view/14841.