Yanisa Rat-a-pa. 1991. Extraction of colorants from the cob of deep purple corn. Bangkok:Kasetsart University;
Yanisa Rat-a-pa. (1991) Extraction of colorants from the cob of deep purple corn (รายงานผลงานวิจัย). Kasetsart University:Bangkok.
Yanisa Rat-a-pa. Extraction of colorants from the cob of deep purple corn. Bangkok:Kasetsart University, 1991.
Yanisa Rat-a-pa. (1991) Extraction of colorants from the cob of deep purple corn (รายงานผลงานวิจัย). Kasetsart University:Bangkok.