APA način citiranja

Soumerai, S. B., & Koppel, R. (2019). Instrumental variables: The power of wishful thinking vs the confounded reality of comparative effectiveness research. Health Serv Res.

Čikaški stil citiranja

Soumerai, Stephen B., i Ross Koppel. "Instrumental Variables: The Power of Wishful Thinking Vs the Confounded Reality of Comparative Effectiveness Research." Health Serv Res 2019.

MLA način citiranja

Soumerai, Stephen B., i Ross Koppel. "Instrumental Variables: The Power of Wishful Thinking Vs the Confounded Reality of Comparative Effectiveness Research." Health Serv Res 2019.