1. Directive 2004/24/EC of the European Parliament and of the Council of 31 March 2004 amending, as regards traditional herbal medicinal products, Directive 2001/83/EC on Community code relating to medicinal products for human use;Off J Eur Commun,2004
2. European Medicines Agency Committee on Herbal Medicinal Products (HMPC) Herbal medicines for human use http://www.ema.europa.eu/ema/index.jsp?curl=pages/medicines/landing/herbal_search.jsp
3. Community herbal monograph on Achillea millefolium L., herba http://www.ema.europa.eu/docs/en_GB/document_library/Herbal_-_Community_herbal_monograph/2011/09/WC500115470.pdf
4. Community herbal monograph on Achillea millefolium L., flos http://www.ema.europa.eu/docs/en_GB/document_library/Herbal_-_Community_herbal_monograph/2011/09/WC500115469.pdf
5. α-Peroxyachifolid and other new sensitizing sesquiterpene lactones from yarrow (Achillea millefolium L., Compositae);Hausen;Contact Dermatitis,1991