Kalsum , U.; Soetanto, H.; Achmanu; Sjofjan, O. Influence of a Probiotic Containing Lactobacillus Fermentum on the Laying Performance and Egg Quality of Japanese Quails. Int. J. Poult. Sci. 2012, 11 (4), 311–315. https://doi.org/10.3923/ijps.2012.311.315.