Sumual, Y. M., J. A. F. Kalangi, and D. D. S. Mukuan. “Pengaruh Kualitas Pelayanan Terhadap Kepuasan Pelanggan PT Otomoto Mantos”. Productivity, vol. 2, no. 1, Mar. 2021, pp. 73-78, https://ejournal.unsrat.ac.id/v3/index.php/productivity/article/view/32912.