1. K. R. Kirtikar and B. D. Basu, Indian Medicinal Plants, Jayyed press, Delhi-6, Vol. III, 2nd Ed., 1975.
2. J. M. Watt and M. G. Breyer-Brandwijk, The Medicinal and Poisonous Plants of Southern and Eastern Africa, 2nd Ed., E. and S. Livingstone Ltd., Edinburgh and London, 1962.
3. A. E. Abd-Ellah, K. M. Mohamed, E. Y. Bakheet, and H. Mohamed, Bull. Pharm. Sci. Assiut Univ., 29 (II), 300 (2006).
4. S. Yamamura, K. Ozawa, K. Ohtani, R. Kasai, and K. Yamasaki, Phytochemistry, 48, 131 (1998).
5. S. Takano, M. Yanase, M. Takahashi, and K. Ogasawara, Chem. Lett., 2017 (1987).