รกิติกุล ว. . “The Synthesis of Hydrogel from Canthium Parvifolium Roxb.’s Pection for Nitrogen Fertilizer Releasing”. Ramkhamhaeng Research Journal of Sciences and Technology, vol. 23, no. 1, June 2020, pp. 39-46, https://li01.tci-thaijo.org/index.php/rusci/article/view/244924.