Anonymous, Guidelines for the Assessment of herbal medicines-WHO Report, Geneva. Anonymous, Pharmacopoeia of India, Govt. of India, Ministry of Health and family welfare, Delhi. Anonymous, Quality Control Methods for Medicinal Plant material, WHO, Geneva Bernes, Herbal medicines, Pharmaceutical press, London Bovey, Nuclear Magnetic Resonance Spectroscopy, Academic Press Inc., New York, U.S.A. Cannell, Natural Products Isolation, Humana Press, New Jersey. Constable and Sanders, NMR Workbook, RSC, London, UK. Cupp, Toxicology and Clinical Pharmacology of Herbal Products, Humana Press, New Jersy. Dyer, Spectroscopy, Oxford University Press, Kolkata, India. Endress, Plant cell Biotechnology, Springer-Verlag, Berlin. Fleming, PDR for Herbal Medicine, Medical Economics Company, Mountvale, New Jersey. Handa and Kaul, Supplement to cultivation and utilization of medicinal plants, R.R.L Jammu, India. Kaufmann, Natural Products from Plants, CRC Press, New York. Kemp, Organic Spectroscopy, ELBS, Mac Millan, Hampshire,U.K. Nakanishi, Chemistry of Natural Products, Kodansha Book Publishing Company, Osaka, Japan Rastogi, Compendium of Indian Medicinal Plants, CSIR, New Delhi. Reinert and Bajaj, Applied and Fundamental Aspects of Plant Cell, Tissue and Organ Culture, Narora Publishing House, New Delhi. Sethi, High performance liquid chromatography, CBS publishing House, New Delhi. Silverstein, Bassler and Morrill, Spectrometric Identification of Organic Compounds, John Wiley and Sons Inc., New York, U.S.A. Stahl, Thin Layer chromatography -A laboratory handbook, Springer-Verlag, Berlin. Street, Plant Tissue and Cell Culture, Blackwell Scientific Publication, London. Tyler, Brady and Robbers, Pharmacognosy, Lea and Febiger, Philadelphia. Vickery and Vickery, Secondary Plant Metabolism, The Macmillan Press Ltd, London. Walton and Brown, Chemicals from Plants, Imperial College Press, London Williams and Fleming, Spectroscopic Methods in Organic Chemistry, Tata Mc Graw-Hill Publishing Company Ltd., New Delhi, India.