Narasimha Rao, V., and A. V. V. Siva Prasad. 2011. “Customer Relationship Management (CRM) in Health Care Industry - A Study of Select Corporate Hospitals in Vijayawada, Andhra Pradesh”. Indian Journal of Marketing 41 (5):20-30. https://indianjournalofcomputerscience.com/index.php/ijom/article/view/37666.