1. Burkill, H.M. (1985). The useful plants of West Tropical Africa. 4, Families M-R: Royal Botanical Gardens, Kew, Richmond, United Kingdom. 969 p.
2. British Pharmacopoeia, (1980). Vol. II, H.M Stationary Office, London, p A109.
3. Adams, R.P. (1989). Identification of Essential oils by Ion Trap Mass Spectroscopy. Academic Press. Inc., USA.