Sakhong, D., T. Vongpralub, S. Katawatin, and S. Sirisathien. “Ovarian Follicular Patterns and Hormone Profile in Thai Native Cattle (Bos Indicus)”. The Thai Journal of Veterinary Medicine, vol. 41, no. 4, June 2013, pp. 439-48, https://he01.tci-thaijo.org/index.php/tjvm/article/view/9614.