1. Goldenseal in world trade: pressures and potentials;Bannerman;Herbal Gram.,1997
2. Micropropagation of Hydrastis canadensis: goldenseal a North American endangered species;Bedir;Planta Med.,2003
3. Herb market levels after five years of bloom: 1999 sales in mainstream market up only 11% in first half of 1999 after 55% in crease in 1998;Blumenthal;Herbal Gram.,1999
4. Handbook of Medicinal Herbs;Duke,2001
5. Temporary immersion systems in plant micropropagation;Etienne;Plant Cell Tiss. Org. Cult.,2002