Kannika Sthapitanonda. 1993. Extraction and analysis of lignin from pulping waste liquor. Bangkok:TISTR;
Kannika Sthapitanonda. (1993) Extraction and analysis of lignin from pulping waste liquor (รายงานผลงานวิจัย). TISTR:Bangkok.
Kannika Sthapitanonda. Extraction and analysis of lignin from pulping waste liquor. Bangkok:TISTR, 1993.
Kannika Sthapitanonda. (1993) Extraction and analysis of lignin from pulping waste liquor (รายงานผลงานวิจัย). TISTR:Bangkok.