Tarmuji, A., T. Setiadi, S. Handayaningsih, and J. Lestari. “Development of Customer Relationship Management (CRM) Model Based on the Maturity Level of Cobit 4.1 (Case Study: Cooperative Section at the Department of Industry, Trade, Cooperative, and Small-Medium Enterprises, Yogyakarta Province)”. Asia-Pacific Journal of Science and Technology, vol. 22, no. 2, Apr. 2017, pp. APST-22, doi:10.14456/apst.2017.9.