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Ptacek, J., Dolick, K., & Mattson, M.  (2017, September 26). Advocacy Groups as Agents for Change in Health and Risk Messaging. Oxford Research Encyclopedia of Communication. Retrieved 23 Jan. 2021, from https://oxfordre.com/communication/view/10.1093/acrefore/9780190228613.001.0001/acrefore-9780190228613-e-228.

Ptacek, Jen, Kirstin N. Dolick, and Marifran Mattson. "Advocacy Groups as Agents for Change in Health and Risk Messaging." Oxford Research Encyclopedia of Communication.  September 26, 2017. Oxford University Press. Date of access 23 Jan. 2021, <https://oxfordre.com/communication/view/10.1093/acrefore/9780190228613.001.0001/acrefore-9780190228613-e-228>

Ptacek, Jen, Kirstin N. Dolick, and Marifran Mattson. "Advocacy Groups as Agents for Change in Health and Risk Messaging." Oxford Research Encyclopedia of Communication. 26 Sep. 2017; Accessed 23 Jan. 2021. https://oxfordre.com/communication/view/10.1093/acrefore/9780190228613.001.0001/acrefore-9780190228613-e-228.