Aulia, M. R. “The Interpersonal Communication of Hijrah Laundry Coin Public Relations Is an Effective Method for Maintaining Customer Loyalty in Medan, Johor”. Indonesian Journal of Communication and Social, vol. 1, no. 2, Sept. 2024, p. 72-75, https://ijocial.web.id/index/index.php/ijocial/article/view/15.