Prapaporn Savaraj. (1998) Effect of cooking processes on the level of nitrate and nitrite in vegetables. Mahidol University,:ม.ป.ท.Prapaporn Savaraj. 1998. Effect of cooking processes on the level of nitrate and nitrite in vegetables. ม.ป.ท.:Mahidol University,;Prapaporn Savaraj. Effect of cooking processes on the level of nitrate and nitrite in vegetables. ม.ป.ท.:Mahidol University, 1998. Print.