A. Ngamsaeng, M. Wanapat, and S. Khampa, “Effects of Mangosteen Peel (Garcinia mangostana) Supplementation on Rumen Ecology, Microbial Protein Synthesis, Digestibility and Voluntary Feed Intake in Cattle”, Pak. J. Nutr., vol. 5, no. 5, pp. 445–452, Aug. 2006, doi: 10.3923/pjn.2006.445.452.