Sharma, K B, Shashi Nayyar, V S Malik, Rajvir Singh, and S P S Sodhi. 2012. “Levels of Hormones and Minerals in Cyclic, Anestrus and Subestrus Buffalo Heifers”. The Indian Journal of Animal Sciences 69 (4). https://epubs.icar.org.in/index.php/IJAnS/article/view/20441.