Chinawut Wongwijitkaesorn. (1997) Citric acid production from tapioca starch in stirred tank bioreactor by Aspergillus niger. Mahidol University,:ม.ป.ท.Chinawut Wongwijitkaesorn. 1997. Citric acid production from tapioca starch in stirred tank bioreactor by Aspergillus niger. ม.ป.ท.:Mahidol University,;Chinawut Wongwijitkaesorn. Citric acid production from tapioca starch in stirred tank bioreactor by Aspergillus niger. ม.ป.ท.:Mahidol University, 1997. Print.