Chandra, Adhi Nugroho, et al. “Pencapaian Tujuan Perusahaan Dengan Customer Relationship Management Pada Industri Jasa Telekomunikasi”. ComTech: Computer, Mathematics and Engineering Applications, vol. 4, no. 2, Dec. 2013, pp. 950-6, doi:10.21512/comtech.v4i2.2536.