Pongtorn Sungpuag. (1993) Development of database for vitamin A and beta carotene in Thai foods and establishment of simplified dietary assessment of retinal equivalent consumption. Mahidol University,:ม.ป.ท.Pongtorn Sungpuag. 1993. Development of database for vitamin A and beta carotene in Thai foods and establishment of simplified dietary assessment of retinal equivalent consumption. ม.ป.ท.:Mahidol University,;Pongtorn Sungpuag. Development of database for vitamin A and beta carotene in Thai foods and establishment of simplified dietary assessment of retinal equivalent consumption. ม.ป.ท.:Mahidol University, 1993. Print.