Syahruddin , Erman, et al. “Substituting Soybean Meal With Fermented Leaves and Seeds of Rubber Trees (Hevea brasiliensis): Effects on Carcass Percentage, Abdominal Fat Percentage and Meat-to-Bone Ratio in Broiler Chickens”. International Journal of Poultry Science, vol. 18, no. 9, Aug. 2019, pp. 416–422, https://doi.org/10.3923/ijps.2019.416.422.