Sutarman, Dr, and Haryono Edi Hermawan. 2019. “The Management Studies in Maintenance of Customer Satisfaction Factors in the Company Industry”. IJO -International Journal of Business Management ( E:ISSN 2811-2504 ) (P.ISSN: 2384-5961) 2 (07), 42-49. https://ijojournals.com/index.php/bm/article/view/187.