Kalsum , U., H. Soetanto, Achmanu, and O. Sjofjan. 2012. “Influence of a Probiotic Containing Lactobacillus Fermentum on the Laying Performance and Egg Quality of Japanese Quails”. International Journal of Poultry Science 11 (4): 311–315. https://doi.org/10.3923/ijps.2012.311.315.