Loongyai , W.; Wiriya, B.; Sangsawang, N. Detection of Salmonella and Escherichia Coli in Egg Shell and Egg Content from Different Housing Systems for Laying Hens. Int. J. Poult. Sci. 2011, 10 (2), 93–97. https://doi.org/10.3923/ijps.2011.93.97.