1. Historical review of traditional medicine;Sofowora,1982
2. Antimicrobial property of the buffered extracts of chewing stick;El-Said;Lloydia,1971
3. Chromatographic studies on Zingiber officinalis;Kucera;J. Chromatogr.,1975
4. Resolution — Promotion and Development of Training and Research in Traditional Medicine;WHO;WHO Document No. WHA 30.49,1977
5. Resolution — Drug Policies and Management: Medicinal Plants;WHO;WHO Document No. WHA 31.33,1978