World Health Organization. (1996). Cancer pain relief: With a guide to opioid availability. Geneva: World Health Organization.
Čikaški stil citiranjaWorld Health Organization. Cancer Pain Relief: With a Guide to Opioid Availability. Geneva: World Health Organization, 1996.
MLA način citiranjaWorld Health Organization. Cancer Pain Relief: With a Guide to Opioid Availability. Geneva: World Health Organization, 1996.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.