Varaporn Tapna. (1994) The study of pharmacokinetic and physiological profiles of caffeine in healthy volunteers. Mahidol University,:ม.ป.ท.Varaporn Tapna. 1994. The study of pharmacokinetic and physiological profiles of caffeine in healthy volunteers. ม.ป.ท.:Mahidol University,;Varaporn Tapna. The study of pharmacokinetic and physiological profiles of caffeine in healthy volunteers. ม.ป.ท.:Mahidol University, 1994. Print.