APA način citiranja

Sibbald, B. (2001). Doctors asked to take pledge to shun drug company freebies.

Čikaški stil citiranja

Sibbald, Barbara. Doctors Asked to Take Pledge to Shun Drug Company Freebies. 2001.

MLA način citiranja

Sibbald, Barbara. Doctors Asked to Take Pledge to Shun Drug Company Freebies. 2001.

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