Kaewtapee, C., and C. Bunchasak. “Comparative Effect of DL-Methionine and DL-Methionine Hydroxy Analogue Supplemented Diet on Productive Performance, Fat Accumulation and Lipid Profile in Blood of Meat-Type Ducks”. The Thai Journal of Veterinary Medicine, vol. 48, no. 4, Mar. 2019, pp. 645-53, https://he01.tci-thaijo.org/index.php/tjvm/article/view/179858.