World Health Organization. (2019). European tobacco use. Trends report 2019. World Health Organization Regional Office for Europe.
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芝加哥风格引文
World Health Organization. European Tobacco Use. Trends Report 2019. Copenhague: World Health Organization Regional Office for Europe, 2019.
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MLA引文
World Health Organization. European Tobacco Use. Trends Report 2019. World Health Organization Regional Office for Europe, 2019.
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警告：这些引文格式不一定是100％准确.