Saengthongpinit, C., Kongsoi, S., Viriyarampa, S. and Songserm, T. 2015. Prevalence and Antimicrobial Resistance of Salmonella and Campylobacter Species Isolated from Laying Duck Flocks in Confinement and Free-grazing Systems. The Thai Journal of Veterinary Medicine. 45, 3 (Sep. 2015), 341–350.