Analysis of information sources in references of the Wikipedia article "Kanker paru-paru" in Indonesian language version.
There is sufficient evidence that involuntary smoking (exposure to secondhand or 'environmental' tobacco smoke) causes lung cancer in humans. ... Involuntary smoking (exposure to secondhand or 'environmental' tobacco smoke) is carcinogenic to humans (Group 1).
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(bantuan). Journal of Medical Investigation. 57 (1–2): 1–11. PMID 20299738. [pranala nonaktif permanen]|url=
(bantuan). Journal of Medical Investigation. 57 (1–2): 1–11. PMID 20299738. [pranala nonaktif permanen]Secondhand smoke exposure causes disease and premature death in children and adults who do not smoke.