Sinawat, S., K. Seejorn, T. Pongsritasana, and N. Sridongyang. “Male Factor Infertility in Srinagarind Hospital”. Srinagarind Medical Journal, vol. 15, no. 2, Nov. 2013, pp. 87-90, https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/14221.