Dr. Shamsher Singh, Dr. Naveen J Sirohi, and Ms. Kumkum Chaudhary. 2014. “A Study of Customer Perception towards Service Quality of Life Insurance Companies in Delhi NCR Region”. Global Journal of Management and Business Research 14 (E7):19-31. https://journalofbusiness.org/index.php/GJMBR/article/view/1563.