World Health Organization (WHO) International Agency for Research on Cancer (IARC), Title: IARC Monographs on the Evaluation of Carcinogenic Risks to Humans, Volume 89, Smokeless Tobacco and Some Tobacco-specific N-Nitrosamines, Lyon, France, 2007, Historical Overview 1.1.2 Snuff taking, pp. 43–47, ISBN 9789283212898[1]
