APA-viite (7. p.)
Hopkinson, N., & et al. (2021). Current smoking and COVID-19 risk: Results from a population symptom app in over 2.4 million people.
Chicago-viite (17. p.)
Hopkinson, N.S, ja et al. Current Smoking and COVID-19 Risk: Results from a Population Symptom App in over 2.4 Million People. 2021.
MLA-viite (9. p.)
Hopkinson, N.S, ja et al. Current Smoking and COVID-19 Risk: Results from a Population Symptom App in over 2.4 Million People. 2021.
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