APA (7th ed.) Zitazioa
Hackshaw, A. K. (2015). A concise guide to observational studies in healthcare. John Wiley & Sons Inc..
Chicago Style (17th ed.) Zitazioa
Hackshaw, Allan K. A Concise Guide to Observational Studies in Healthcare. Chichester, West Sussex, United Kingdom: John Wiley & Sons Inc., 2015.
MLA (9th ed.) Zitazioa
Hackshaw, Allan K. A Concise Guide to Observational Studies in Healthcare. John Wiley & Sons Inc., 2015.
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