Phuanjai Boonjun. (1990) The effect of brief maximal isometric exercise on strength and endurance of quadriceps femoris. Mahidol University,:ม.ป.ท.Phuanjai Boonjun. 1990. The effect of brief maximal isometric exercise on strength and endurance of quadriceps femoris. ม.ป.ท.:Mahidol University,;Phuanjai Boonjun. The effect of brief maximal isometric exercise on strength and endurance of quadriceps femoris. ม.ป.ท.:Mahidol University, 1990. Print.