Pratama, Dicky, et al. “The Effects of Service Quality Satisfaction of the Outpatients in Graha Specialists of Provincial General Hospital Dr. Mohammad Hoesin Palembang”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 25, no. 2, Feb. 2016, pp. 364-73, https://www.gssrr.org/JournalOfBasicAndApplied/article/view/5315.