Duran, Danilda Hufana, et al. “Production of River Buffalo (Bubalus Bubalis) Calves by Embryo in Vitro Production-Vitrification and Transfer Techniques in the Philippines”. Buffalo Bulletin, vol. 36, no. 4, Dec. 2017, pp. 607-14, https://kuojs.lib.ku.ac.th/index.php/BufBu/article/view/914.