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Covington, and Burling. "Summary Of Data On Urea." Truth Tobacco Industry Documents, 17 Apr. 1986. Excerpt.
Pankow, JF, et al. "Conversion of nicotine in tobacco smoke to its volatile and available free-base form through the action of gaseous ammonia." American Chemical Society. 1997. 31(8): 2428-2433.
Huang, CT, et al. "Uric acid and urea in human sweat." Chinese Journal of Physiology, 30 Sept. 2002. 45(3): 109-15.
Foster, K.G. "Composition of the Secretion from the Eccrine Sweat Glands of the Cat's Foot Pad." The Journal of Physiology, 1966. 184(1): 106-09.
"Cigarette Ingredients. R.J. Reynolds List of Ingredients." R.J. Reynolds. 2013. Web.
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