Siallagan, Y. O. ., N. F. Saragih, and J. M. . Hutapea. “IMPLEMENTASI CUSTOMER RELATIONSHIP MANAGEMENT(CRM) PADA TOKO ROTI GANDA BERBASIS WEB”. METHODIKA: Jurnal Teknik Informatika Dan Sistem Informasi, vol. 6, no. 1, Mar. 2020, pp. 6-13, https://ejurnal.methodist.ac.id/index.php/methodika/article/view/247.