APA-referens (7:e uppl.)
Hopkinson, N., & et al. (2021). Current smoking and COVID-19 risk: Results from a population symptom app in over 2.4 million people.
Chicago-referens (17:e uppl.)
Hopkinson, N.S, och et al. Current Smoking and COVID-19 Risk: Results from a Population Symptom App in over 2.4 Million People. 2021.
MLA-referens (9:e uppl.)
Hopkinson, N.S, och et al. Current Smoking and COVID-19 Risk: Results from a Population Symptom App in over 2.4 Million People. 2021.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.