1) World Health Organization. Quality control methods for medicinal plant materials. Geneva, World Health Organization, 1998.
2) World Health Organization. WHO monographs on selected medicinal plants. Vol. I. Geneva, World Health Organization, 1999.
3) World Health Organization Regional Office for the Western Pacific. Research guidelines for evaluating the safety and efficacy of herbal medicines. Manila, World Health Organization Regional Office for the Western Pacific, 1993.
4) World Health Organization. Regulatory situation of herbal medicines: a worldwide review. Geneva, World Health Organization, 1998 (unpublished document WHO/TRM/98.1; available on request from Traditional Medicine (TRM/EDM/HTP), World Health Organization, 1211 Geneva 27, Switzerland).
5) World Health Organization. Guidelines on basic training and safety in acupuncture. Geneva, World Health Organization, 1999 (unpublished document WHO/EDM/TRM/99.1; available on request from Traditional Medicine (TRM/EDM/HTP), World Health Organization, 1211 Geneva 27, Switzerland).