Source

"Smoking and Tobacco Control." U.S. Department of Health and Human Services, Public Health Service, National Institutes of Health, National Cancer Institute. Bethesda, MD. Risks Associated with Smoking Cigarettes with Low Machine-Measured Yields of Tar and Nicotine. 19 Nov. 2001.

http://cancercontrol.cancer.gov/tcrb/monographs/13/m13_complete.pdf

IFC Consulting. "Methods for Estimating Methane Emissions From Domestic Animals." 8(6). Oct. 1999.

http://infohouse.p2ric.org/ref/17/ttn/volume08/viii06.pdf

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