World Health Organization. (1996). Cancer pain relief: With a guide to opioid availability. Geneva: World Health Organization.
Trích dẫn kiểu ChicagoWorld Health Organization. Cancer Pain Relief: With a Guide to Opioid Availability. Geneva: World Health Organization, 1996.
MLA citiranjeWorld Health Organization. Cancer Pain Relief: With a Guide to Opioid Availability. Geneva: World Health Organization, 1996.
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