Phuengkasem, A., S. Attamangkune, and Y. Ruangpanit. 2017. “A Comparison of Essential Oil and Organic Acid Supplementation on the Live Performance and Intestinal Morphology of Broilers Fed a Diet Containing Palm Kernel Meal”. International Journal of Poultry Science 16 (5): 196–202. https://doi.org/10.3923/ijps.2017.196.202.