Lukkana, M., Jantrakajorn, S. and Wongtavatchai, J. 2015. In vitro Suppression against Streptococcal Bacteria and Health-Promoting Effects of Probiotic Bacillus polyfermenticus in Tilapia (Oreochromis niloticus). The Thai Journal of Veterinary Medicine. 45, 1 (Mar. 2015), 121–129.