1. 1. "Helping People Lose Weight for 45 Years". 2. David Kirchhoff, Our New Program the Next Level, retrieved 2010-12-29 3. "Lifetime Membership FAQ". 4. "Home Page". Weight Watchers of Philadelphia. Retrieved 2008-06-07. "This website is operated by Weight Watchers of Philadelphia, Inc. [punctuation sic] a franchise of Weight Watchers International, Inc." 5. "Weight Watchers Summary of Plan Options". Retrieved 2010-12-27. 6. MOISIO, R., & BERUCHASHVILI, M. (2010). "Questing for Well-Being at Weight Watchers: The Role of the Spiritual- Therapeutic Model in a Support Group". Journal of Consumer Research, 36(5), 857-875. 7. The Weight Watchers Research Dept. (2008). "The Benefits of a Supportive Environment". Weight Watchers International. Retrieved 2008-06-07. "Research has found that those who attend Weight Watchers meetings lose three times more weight than those who try to lose weight on their own." 8. "Weight Watchers - Bahamas". Weight Watchers International. 2007. Retrieved 2008-06-07. "Research shows that people who attend Weight Watchers meetings lose three times more weight than those who diet on their own." 9. Broughton, Sherri (July 2006). "Open Enrollment" (PDF). Weight Watchers International. p. 1. Retrieved 2008-06-07. "Research shows that people who attend Weight Watchers meetings lose three times more weight than people dieting on their own[.]" 10. "Sell Sheet" (PDF). Weight Watchers International. October 2005. p. 1. Retrieved 2008-06-07. "It’s been proven that attending meetings leads to successful weight loss. Research shows that people who attend Weight Watchers meetings lose three times more weight than people dieting on their own." 11. Heshka, Stanley; Anderson, James W.; Atkinson, Richard L.; Greenway, Frank L.; Hill, James O.; Phinney, Stephen D.; Kolotkin, Ronette L.; Miller-Kovach, Karen; Pi-Sunyer, F. Xavier (2003-04-09). "Weight Loss With Self-help Compared With a Structured Commercial Program: A Randomized Trial". JAMA: the Journal of the American Medical Association (American Medical Association) 289 (14): 1792–1798. doi:10.1001/jama.289.14.1792. PMID 12684357. Retrieved 2008-06-06. "...[M]ean (SD) weight loss... in the commercial group was greater than in the self-help group at 1 year (-4.3 [6.1] kg vs -1.3 [6.1] kg, respectively...) and at 2 years (-2.9 [6.5] kg vs -0.2 [6.5] kg, respectively...)." 12. "eTools, the Internet companion". Weight Watchers International. 2008. Retrieved 2008-06-07. "People who both attend Weight Watchers meetings and use eTools lose over 50% more weight on average than those who attend weekly meetings alone....Weight loss data based on 12 week study comparing people who were instructed to attend Weight Watchers meetings and use eTools to people who were instructed to attend Weight Watchers meetings alone." 13. Dansinger, Michael L.; Gleason, Joi Augustin; Griffith, John L.; Selker, Harry P.; Schaefer, Ernst J. (2005-01-05). "Comparison of the Atkins, Ornish, Weight Watchers, and Zone Diets for Weight Loss and Heart Disease Risk Reduction: A Randomized Trial". JAMA: the Journal of the American Medical Association (American Medical Association) 293 (1): 43–53. doi:10.1001/jama.293.1.43. PMID 15632335. Retrieved 2008-06-07.