Raval, A. P., L. M. Sorathiya, M. A. Katariya, V. B. Kharadi, V. R. Patel, N. B. Patel, and A. B. Parmar. 2019. “Effect of Challenge Feeding on Production Performance of Surti Buffaloes”. International Journal of Livestock Research 9 (7). India:164-70. http://ijlr.org/ojs_journal/index.php/ijlr/article/view/1196.