Wongsa, P., et al. “Dietary Caesalpinia Sappan Bark Extract Improves Intestinal Morphology and Modulates Immune- and Antioxidant-Related Gene Expression in Broilers”. Tropical Animal Science Journal, vol. 50, no. 1, Oct. 2026, p. 33, https://doi.org/10.5398/tasj.2027.50.1.33.