1. J.C.T. Uphof. Dictionary of Economic Plants, 2nd ed.; Verlag von J. Cramer, Lehre, Germany (1968).
2. The Condensed Chemical Dictionary,8th ed., G.G. Hawley, Ed., Van Nostrand Reinhold, New York (1971).
3. V.E. Tyler, L.R. Brady, and J.E. Robbers. Pharmacognosy,7th ed., Lea and Febiger, Philadelphia (1976), pp. 76–77, 87–92, 197–226, and 472–480.
4. Kirk-Othmer Encyclopedia of Chemical Technology,3rd ed., John Wiley and Sons (Wiley-Interscience), New York (1978), pp. 6:743, 765, 8:855, 12:621, 639, 15:475, 21:422, 650, 655, and 905.
5. A.Y. Leung. Encyclopedia of Common Natural Ingredients Used in Food, Drugs, and Cosmetics, John Wiley and Sons ( Wiley-Interscience ), New York (1980).