Leardkamolkarn, V., R. Somana, S. Rojananuengnit, and P. Tosukhowong. “Failure of Inducing Spermatogenesis with FSH, LH and Testosterone in Vitamin A Deficient Rat”. Journal of Basic and Applied Pharmacology, vol. 8, no. 3, July 2015, pp. 153-60, https://li01.tci-thaijo.org/index.php/JBAP/article/view/36388.