Songsak Chumpawadee, Kritapon Sommart, Thevin Vongpralub, and Virote Pattarajinda. 2006. “In sacco Degradation Characteristics of Crop Residues and Selected Roughages in Brahman-Thai Native Crossbred Steers”. Agriculture and Natural Resources 40 (1). Bangkok, Thailand:204-14. https://li01.tci-thaijo.org/index.php/anres/article/view/243550.