Proctor, Robert N. (2012). „The history of the discovery of the cigarette–lung cancer link: Evidentiary traditions, corporate denial, global toll: Table 1”. Tobacco Control. 21 (2): 87—91. PMID22345227. S2CID2734836. doi:10.1136/tobaccocontrol-2011-050338.
Proctor, Robert N. (2012). „The history of the discovery of the cigarette–lung cancer link: Evidentiary traditions, corporate denial, global toll: Table 1”. Tobacco Control. 21 (2): 87—91. PMID22345227. S2CID2734836. doi:10.1136/tobaccocontrol-2011-050338.
Proctor, Robert N. (2012). „The history of the discovery of the cigarette–lung cancer link: Evidentiary traditions, corporate denial, global toll: Table 1”. Tobacco Control. 21 (2): 87—91. PMID22345227. S2CID2734836. doi:10.1136/tobaccocontrol-2011-050338.