1. Ceylon Spices in the International Spice Trade, CISIR, Colombo. 1971.
2. et al. Ceylon Patent No. 6924 of 7th July 1972.
3. also: ; CISIR Natural Products Monograph Ser. 1 1973, No. 1.
4. The Essential Oils Van Nostrand, New York. 1950, Vol. 4, pp. 223–240.