1. Quinine, an old anti-malarial drug in a modern world: Role in the treatment of malaria;Achan;Malaria Journal,2011
2. Nature's medicinal bounty: Don't throw it away;Akerele;World Health Forum,1993
3. Safety profile of caffeine and 1,3-dimethylamylamine supplementation in healthy men;Bloomer;Human and Experimental Toxicology,2013
4. The environment and disease: Association or causation? President's address;Bradford-Hill;Proceedings of the Royal Society of Medicine,1965
5. British Herbal Compendium, 1992. British Herbal Medicine Association.