Prucsasri, Prattana, Cholasit Janasan, Somtop Kantong, and Somak Priabprom. 1990. “Fattenning of American Brahman Crossbred by Small Farmers”. Kasetsart Journal of Social Sciences 11 (1):1-11. https://so04.tci-thaijo.org/index.php/kjss/article/view/243968.