Worapol Aengwanich และ Thongchai Boonsorn and Komvut Thammasar. (2016) Factors affecting the intervention to increase the biosecurity levels of poultry production clusters (PPCs) in Thailand. <i>Research & Knowledge</i>, <i>2</i>(2), 59-67.Worapol Aengwanich และ Thongchai Boonsorn and Komvut Thammasar. "Factors affecting the intervention to increase the biosecurity levels of poultry production clusters (PPCs) in Thailand". Research & Knowledge 2 (2016):59-67.Worapol Aengwanich และ Thongchai Boonsorn and Komvut Thammasar. Factors affecting the intervention to increase the biosecurity levels of poultry production clusters (PPCs) in Thailand. Mahasarakham University:ม.ป.ท. 2016.