How to Clean Calcium Deposits From Your Toilet Bowl

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Better Homes and Gardens. "How do you remove calcium/lime deposits from water fountains?" 2012. (May 30, 2012). http://www.bhg.com/advice/gardening/gardening/how-do-you-remove-calciumlime-deposits-from-water-fountains/
Braff, Danielle. "Hard facts about tap water." Chicago Tribune. April 25, 2012. (May 30, 2012). http://articles.chicagotribune.com/2012-04-25/health/sc-health-0425-hard-soft-water-20120425_1_hard-water-soft-water-calcium-and-magnesium
Carter, Tim. "Muriatic acid is best for removing stubborn toilet bowl stains." SILive.com. August 12, 20120. (May 30, 2012). http://www.silive.com/homegarden/homeimprovement/index.ssf/2010/08/muriatic_acid_is_best_for_remo.html
Oz, Mehmet, M.D. and Dr. Michael Roizen. "Hard water can be bad for plumbing, good for you." Cleveland.com. Feb. 15, 2011. (May 30, 2012). http://www.cleveland.com/healthfit/index.ssf/2011/02/hard_water_can_be_bad_for_plum.html