Harahap, D. A., R. Hurriyati, D. , V. Gaffar, and D. Amanah. “Service Quality Towards Bank Customer Loyalty (Empirical Study at BNI USU Medan)”. European Journal of Business and Management Research, vol. 4, no. 5, Oct. 2019, doi:10.24018/ejbmr.2019.4.5.115.