Ayasan, Tugay, et al. “The Effects of Dietary Inclusion of Probiotic Protexin on Egg Yield Parameters of Japanese Quails (Coturnix Coturnix Japonica)”. International Journal of Poultry Science, vol. 5, no. 8, July 2006, pp. 776–779, https://doi.org/10.3923/ijps.2006.776.779.