Archer, M. (2008). Proactive opt-in already exists. BMJ Publishing Group Ltd.
Čikaški stil citiranjaArcher, Michael. Proactive Opt-in Already Exists. BMJ Publishing Group Ltd, 2008.
MLA način citiranjaArcher, Michael. Proactive Opt-in Already Exists. BMJ Publishing Group Ltd, 2008.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.