Nguyen, Tuan Van, et al. “Effects of Dietary Protein and Energy on Growth Performance and Carcass Characteristics of Betong Chickens (Gallus Domesticus) During Growing Period”. International Journal of Poultry Science, vol. 9, no. 5, Apr. 2010, pp. 468–472, https://doi.org/10.3923/ijps.2010.468.472.