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1.
Petersen K, Gerken JM. \# Covid-19: An Exploratory Investigation of Hashtag Usage on Twitter. Health Policy. 2021.
Petersen, K. ., & Gerken, J. M. (2021). \# Covid-19: An Exploratory Investigation of Hashtag Usage on Twitter. Health Policy.
Petersen, Kai, und Jan Michael Gerken. 2021. „\# Covid-19: An Exploratory Investigation of Hashtag Usage on Twitter“. Health Policy. Elsevier.
Petersen, Kai, und Jan Michael Gerken. „\# Covid-19: An Exploratory Investigation of Hashtag Usage on Twitter“. Health Policy (2021): n. pag. Print.
Petersen, Kai, und Jan Michael Gerken. „\# Covid-19: An Exploratory Investigation of Hashtag Usage on Twitter“. Health Policy, Elsevier, 2021.