World Health Organization & World Health Organization. (1998). Regulatory Situation of Herbal Medicines. World Health organization.
Chicago-viite (17. p.)World Health Organization ja World Health Organization. Regulatory Situation of Herbal Medicines. Geneva: World Health organization, 1998.
MLA-viite (8. p.)World Health Organization ja World Health Organization. Regulatory Situation of Herbal Medicines. World Health organization, 1998.
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