1. The booming US botanical market;Brevoort;Herbalgram,1998
2. Market report;Blumenthal;Herbalgram,2001
3. The Desktop Guide to Complementary and Alternative Medicine: An Evidence Based Approach;Ernst,2001
4. Hawthorn;Chang;J Clin Pharmacol,2002
5. Phytotherapy in heart failure;Loew;Phytomedicine,1997