1. Caffeine—its identity, dietary sources, intake and biological effects;Graham;Nutr Rev,1978
2. Caffeine content of beverages as consumed;Gilbert;J Canad Med Assoc,1976
3. Physiologic and psychotropic effects of caffeine in man;Stephenson;J Am Diet Assoc,1977
4. Caffeine content of common beverages;Bunker;J Am Diet Assoc,1979
5. Central nervous system stimulants: the xanthines;Rall,1980