Srisagul Sungthongjeen. 1996. Development of ferrous sulfate and ascorbic acid syrup. Bangkok:Mahidol University;
Srisagul Sungthongjeen. (1996) Development of ferrous sulfate and ascorbic acid syrup (รายงานผลงานวิจัย). Mahidol University:Bangkok.
Srisagul Sungthongjeen. Development of ferrous sulfate and ascorbic acid syrup. Bangkok:Mahidol University, 1996.
Srisagul Sungthongjeen. (1996) Development of ferrous sulfate and ascorbic acid syrup (รายงานผลงานวิจัย). Mahidol University:Bangkok.