Supasansatorn, Apichai, Supaporn Chumpol, Kanokphon Ritthitham, Wereyamarst Jaroenkunathum, and Supaporn Phumiamorn. 2021. “Determination of Degree Adsorption of Diphtheria and Tetanus Toxoid in Vaccine by Using Sandwich ELISA”. Thai Food and Drug Journal 28 (3). Nonthaburi, Thailand:22-33. https://he01.tci-thaijo.org/index.php/fdajournal/article/view/252464.