1. Vision Service Plan. Consumer Eyecare Study. Rancho Cordova, CA, (unpublished internal study) 2003.
2. J.D. Power and Associates. 2006 National Retail Vision Satisfaction Study (online article). Available at http://www.jdpower.com/corporate/news/releases/pdf/2006235.pdf. Last accessed July 21, 2008.
3. Appelbaum A. The constant customer. Gallup Management Journal (online serial). Available at http://gmj.gallup.com/content/745/Constant-Customer.aspx. Last accessed July 21, 2008.
4. Practice Advancement Associates for the Management and Business Academy. Key Metrics of Optometric Practice, 2007 edition. Available at http://www.mba-ce.com/downloads/publication_archive/intelligence/KeyMetricsMain207_pub.pdf. Last accessed July 21, 2008.
5. Do you provide value?;Abramson;Eyecare Business,2005