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Howarth RW, Santoro R, and Ingraffea A (2011). Methane and the greenhouse gas footprint of natural gas from shale formations. Climatic Change Letters, doi:10.1007/s10584-011-0061-5, [1] (页面存档备份,存于互联网档案馆)
Lawrence M. Cathles III, et al (2011). "A Commentary on 'The greenhouse-gas footprint of natural gas in shale formations' by R.W. Howarth, R. Santoro, and Anthony Ingraffea." Climatic Change, doi:10.1007/s10584-011-0333-0, [4][永久失效連結]
Howarth RW, Santoro R, and Ingraffea A (2011). Methane and the greenhouse gas footprint of natural gas from shale formations. Climatic Change Letters, doi:10.1007/s10584-011-0061-5, [1] (页面存档备份,存于互联网档案馆)
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