1. ACCENTURE(2013)Accenture 2013 Global Consumer Pulse Survey Global and US Key Findings.www.accenture.com/SiteCollectionDocuments/PDF/Accenture‐Global‐Consumer‐Pulse‐Research‐Study‐2013‐Key‐Findings.pdf. Accessed March 25 2014
2. MIT SLOAN(2014)What Unhappy Customers Want.http://sloanreview.mit.edu/article/what‐unhappy‐customers‐want. Accessed March 25 2014
3. ReichheldF. F. SasserW. E.(1990)Zero Defections: Quality Comes to Services.http://webdb.ucs.ed.ac.uk/operations/honsqm/articles/ZeroDefections.pdf. Accessed March 25 2014