1. Duke, J.A., Godwin, M.J.B., Du Cellier, J., Duke, P.N.K. (2002).Handbook of medicinal Herbs, 2nd ed. CRC Pres, Washington, D.C.
2. Bohhnann, E, Burkhardt, T. and Zdero, C. (1972).Naturally OccuringAcetylenes, Academic Pres, New York.
3. Walter, H.L., Memory, P.F., and Evlin, L. (2003).Medical Botany, 2nd. Ed. P. 345. John Wiley and Sons, New Jersey.