Krabkaew Soparat. (1990) Effects of caffeine on exercise performance. Mahidol University,:ม.ป.ท.Krabkaew Soparat. 1990. Effects of caffeine on exercise performance. ม.ป.ท.:Mahidol University,;Krabkaew Soparat. Effects of caffeine on exercise performance. ม.ป.ท.:Mahidol University, 1990. Print.