1. Okigbo, R.N. and Anuagasi, C.L. (2009).Advances in selected medicinal and aromatic plants indigenous to Africa. Journal of Medicinal Plants Research,3(2):86-95.
2. Newman, D.J. and Cragg, G.M. (2009).Natural product scaffolds as leads to drugs. Future Medicinal Chemistry, 1: 1415-1427.
3. Koehn, F.E. and Carter, G.T.(2005).The evolving role of natural products in drug discovery. Natural Review Drug Discovery, 4: 206-220.
4. Paterson, I. and Anderson, E.A.(2005).The renaissance of natural products as drug candidates.Science,310:451-453.
5. Balunas, M.J. and Kinghorn, A.D.(2005).Drug discovery from medicinal plants. Life Sciences, 78:431-441.
6. Jones, W.P, Chin, Y.W., Kinghorn, A.D.(2006).The role of Pharmacognosy in modern medicine and pharmacy. Current Drug Targets,7: 247-264.
7. Paterson, I. and Anderson, E.A.(2005).The renaissance of natural products as drug candidates.Science,310:451-453.
8. Chin, Y., Balunas, M.J, Chai, H.B, Kinghorn, A.D.(2006).Drug discovery from natural sources. The AAPS Journal, 8(2): 239-253.
9. Koehn, F.E. and Carter, G.T. (2005).The evolving role of natural products in drug discovery. Natural Review Drug Discovery, 4: 206-220.