1. Antibiotic susceptibility testing by standard single disc diffusion method;Bauer;American Journal of Clinical Pathology,1966
2. Dictionary of the Economic Products of the Malay Peninsula;Burkill,1935
3. Phytochemical methods;Harborne,1984
4. Wiart, C., 2002. Medicinal Plants of Southeast Asia, second ed. Prentice Hall Asia, p. 156.