1. American Academy of Dermatology, “Turning Back the Hands of Time,” February 21, 2005.
2. American Academy of Dermatology, “Causes of Aging Skin,” 2005.
3. Cynthia Haines, MD, The Cleveland Clinic of Dermatology, “Cosmetic Procedures: Effects on Aging Skin,” April 2005.
4. John Gray, “The World of Skincare,” 1997.
5. Kathy Peiss, “Hope In a Jar: The Making of America's Beauty Culture,” Henry Holt and Company Inc, New York, 1998.