1. J. O. Kokwaro, “Medicinal Plants of East Africa,” East African Literature Bureau, Nairobi, 1976, p. 196.
2. I. Kubo and K. Nakanishi, “ACS Symposium Series 62, Host Plant Resistance to Pests,” ed. by P. A. Hedin, American Chemical Society, Washington, D.C., 1977, p. 165.
3. I. Kubo and J. A. Klocke, “ACS Symposium Series 208, Plant Resistance to Insects,” ed. by P. A. Hedin, American Chemical Society, Washington D. C., 1983, p. 329.
4. R. W. Estabrook, “Methods in Enzymology,” Vol. X, ed. by R. W. Estabrook and M. E. Pullman, Academic Press Inc., New York, 1967, p. 41.