Rapeepan Tanasaksiri. (1999) Vitamins C, A and E in saliva of school children in Bangkok and Khon Kaen. Mahidol University,:ม.ป.ท.Rapeepan Tanasaksiri. 1999. Vitamins C, A and E in saliva of school children in Bangkok and Khon Kaen. ม.ป.ท.:Mahidol University,;Rapeepan Tanasaksiri. Vitamins C, A and E in saliva of school children in Bangkok and Khon Kaen. ม.ป.ท.:Mahidol University, 1999. Print.