1. WHO Regional Office for The Western Pacific, Guidelines for the Appropriate Use of Herbal Medicines. 1998; Available from http://www.wpro.who.int/publications/pub_9290611243/en/index.html.
2. The European Agency for the Evaluation of Medicinal Products, Mandate for the EMEA Working Party on Herbal Medicinal Products. 2001; Available from http://www.google.com.hk/url?sa=t&rct=j&q=Mandate%20for%20the%20EMEA%20Working%20Party%20on%20Herbal%20Medicinal%20Products&source=web&cd=1&ved=0CCkQFjAA&url=%68%74%74%70%3a%2f%2f%77%77%77%2e%65%6d%61%2e%65%75%72%6f%70%61%2e%65%75%2f%64%6f%63%73%2f%65%6e%5f%47%42%2f%64%6f%63%75%6d%65%6e%74%5f%6c%69%62%72%61%72%79%2f%52%65%67%75%6c%61%74%6f%72%79%5f%61%6e%64%5f%70%72%6f%63%65%64%75%72%61%6c%5f%67%75%69%64%65%6c%69%6e%65%2f%32%30%30%39%2f%31%32%2f%57%43%35%30%30%30%31%37%39%36%33%2e%70%64%66&ei=zGA2UvajLI2giQe9o4D4Aw&usg=AFQjCNFzhGgK29CwR0B6Agkh5YPvS1tKPg&bvm=bv.52164340,d.aGc&cad=rjt.
3. World Health Organization, WHO Guidelines on Safety Monitoring of Herbal Medicines in Pharmacovigilance Systems. 2004; Available from http://www.google.com.hk/url?sa=t&rct=j&q=WHO%20Guidelines%20on%20Safety%20Monitoring%20of%20Herbal%20Medicines%20in%20Pharmacovigilance%20Systems&source=web&cd=1&ved=0CDEQFjAA&url=%68%74%74%70%3a%2f%2f%6c%69%62%64%6f%63%2e%77%68%6f%2e%69%6e%74%2f%70%75%62%6c%69%63%61%74%69%6f%6e%73%2f%32%30%30%34%2f%39%32%34%31%35%39%32%32%31%34%5f%65%6e%67%2e%70%64%66&ei=El82UsuKPOuXiQes2YDADA&usg=AFQjCNGSAX3mvFr6FmvEXUcPLZouBaBeUQ&bvm=bv.52164340,d.aGc&cad=rjt.
4. Council of Europe, Guidelines on the Quality, Safety and Marketing of Plant-Based Food Supplements. 2005; Available from http://www.google.com.hk/url?sa=t&rct=j&q=Guidelines%20%20%20Use%20of%20dietary%20supplements&source=web&cd=1&cad=rja&ved=0CC4QFjAA&url=%68%74%74%70%3a%2f%2f%77%77%77%2e%63%6f%65%2e%69%6e%74%2f%74%2f%65%2f%73%6f%63%69%61%6c%5f%63%6f%68%65%73%69%6f%6e%2f%73%6f%63%2d%73%70%2f%70%75%62%6c%69%63%5f%68%65%61%6c%74%68%2f%6e%75%74%72%69%74%69%6f%6e%5f%66%6f%6f%64%5f%63%6f%6e%73%75%6d%65%72%5f%68%65%61%6c%74%68%2f%47%75%69%64%65%6c%69%6e%65%73%25%32%30%66%6f%6f%64%25%32%30%73%75%70%70%6c%65%6d%65%6e%74%73%25%32%30%25%32%30%32%33%2e%30%36%2e%30%35%2e%70%64%66&ei=gl02UrO6DcqviQfMg4CICQ&usg=AFQjCNEH5HdPERxVLCPuiv_Igy20KJrQCA&bvm=bv.52164340,d.aGc.
5. Application of LC–ESI–MS–MS for detection of synthetic adulterants in herbal remedies