Coba jelasin Lihat pula dari Fitofarmakologi dong

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Friebolin, H., 2005, Basic One-and Two-Dimensional NMR Spectroscopy, Fourth, Completely Revised and Updated Edition, Wiley-VCH Verlag Gmbh & Co. KgaA, weinheim, Germany

Grimminger, W., 1996, Quality Requirements for Herbal Drugs That Contain Minimally Processed Plant Material, USP open conference on botanicals for medicinal and dietary uses: standards and information issues, P 7-13, The united States Pharmacopeial Convention, Inc, Maryland