APA (7th ed.) Citation

13. Lung cancer kills thirteen times more smokers than non smokers. Is thirteen going to be your unlucky number.

Chicago Style (17th ed.) Citation

13. Lung Cancer Kills Thirteen Times More Smokers than Non Smokers. Is Thirteen Going to Be Your Unlucky Number.

MLA (8th ed.) Citation

13. Lung Cancer Kills Thirteen Times More Smokers than Non Smokers. Is Thirteen Going to Be Your Unlucky Number.

Warning: These citations may not always be 100% accurate.