Sadarman, IrawanA., HidayatC., Elfawati, SholikinM. M., HarahapR. P., RusliR. K., SolfaineR., SofyanA., Nahrowi, and JayanegaraA. “Propolis Supplementation on Broiler Chicken Performances, Nutrient Digestibility, and Carcass Characteristics: A Meta-Analysis”. Tropical Animal Science Journal, Vol. 44, no. 4, Nov. 2021, pp. 425-33, doi:10.5398/tasj.2021.44.4.425.