Singh, A., Tewari, E. and Ravi, P. (2020) “SERVQUAL (Service Quality) vs NPS (Net Promoter Score) : A Comparative Study of Private and Public Hospitals in Sikkim”, Indian Journal of Marketing, 50(10-11), pp. 23–39. doi: 10.17010/ijom/2020/v50/i10-11/155840.