Chumlong Arunlertaree, and Ek Rakyuttithamkul. 2006. “Utilization of Fermented Feather Meal as a Replacement of Fish Meal in the Diet of Hybrid Clarias Catfish”. Agriculture and Natural Resources 40 (2). Bangkok, Thailand:436-48. https://li01.tci-thaijo.org/index.php/anres/article/view/243686.