Sunitda Khawthong และ Jurairat Nunthanid. (2011) Structural modification of chitosan with phthalic anhydride and physicochemical and film forming properties. Silpakorn University:ม.ป.ท.Sunitda Khawthong และ Jurairat Nunthanid. 2011. Structural modification of chitosan with phthalic anhydride and physicochemical and film forming properties. ม.ป.ท.:Silpakorn University;Sunitda Khawthong และ Jurairat Nunthanid. Structural modification of chitosan with phthalic anhydride and physicochemical and film forming properties. ม.ป.ท.:Silpakorn University, 2011. Print.