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Sources

• Fankhauser, David B., Ph.D. "Yogurt Making Illustrated." U.C. Clermont College.
  http://biology.clc.uc.edu/Fankhauser/cheese/yogurt_making/yogurt2000.htm
• Koenig, Vicki, MS, RD, CDN. "Yogurt's History and Folklore." Stonyfield Yogurt.
  http://www.stonyfield.com/wellness/MooslettersDisplay.cfm?moos_id=16
• Reeps, Michael W. "How to Make Yogurt." MakeYourOwnYogurt.
  http://www.makeyourownyogurt.com/
• Willenberg, Barbara J., Karla Vollmar Hughes, Lyn Konstant. "Making Yogurt at Home." Department of Food Science and Human Nutrition, University of Missouri-Columbia.
  http://www.chetday.com/howtomakeyogurt.htm