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-Richter P., Pechacek T., Swahn M., Wagman V. (2008). Reducing Levels of Toxic Chemicals in Cigarette Smoke: A New Healthy People 2010 Objective. Public Health Reports 123 (1), 30 - 38. 

-Green Dannielle. (2019). Cigarette butts are the forgotten plastic pollution - and they could be killing our plants. The conversation: Science and Technology. https://theconversation.com/cigarette-butts-are-the-forgotten-plastic-pollution-and-they-could-be-killing-our-plants-119958

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