APA aipamena

Archer, M. (2008). Proactive opt-in already exists. BMJ Publishing Group Ltd.

Chicago Style aipamena

Archer, Michael. Proactive Opt-in Already Exists. BMJ Publishing Group Ltd, 2008.

MLA aipamena

Archer, Michael. Proactive Opt-in Already Exists. BMJ Publishing Group Ltd, 2008.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.