Trisiriwnich, S. ., S. . Lhanwong, T. . Sompong, and P. . Songthananit. “Potency Test of Diphtheria Vaccine by Using ELISA Technique to Evaluate in Mice Immune Response”. Thai Food and Drug Journal, vol. 27, no. 3, Sept. 2020, pp. 59-66, https://he01.tci-thaijo.org/index.php/fdajournal/article/view/244978.