1. E. L. Rice, Allelopathy, New York: Academic Press, 1974, pp. 32–36.
2. Allelopathy—a natural alternative for weed control
3. D. E. Barnes and L. G. Chan, Common Weeds of Malaysian and Their Control, Selangor: Ancom berhad, 1990, pp. 38–324.
4. M. A. Altieri, “The Impact, Uses and Ecological Role of Weeds in Agrosystems” in Weed Management in Agrosystem, edited by M. A. Alteieri, and M. Liebman, Florida: CRC Press Inc, 1988, pp. 2–6.
5. N. Jeetendra and B. Manis, International Journal of Pharmacy and Pharmaceutical Sciences 3 (2), 48–52 (2010).