Panadda Pradniwat. (2551) Competition Strategy between proprietary and Open Source Software in the Presence of Software Piracy and Network Externalities. <i>วารสารเศรษฐศาสตร์ธรรมศาสตร์</i>, <i>26</i>(1), .Panadda Pradniwat. "Competition Strategy between proprietary and Open Source Software in the Presence of Software Piracy and Network Externalities". วารสารเศรษฐศาสตร์ธรรมศาสตร์ 26 (2551):.Panadda Pradniwat. Competition Strategy between proprietary and Open Source Software in the Presence of Software Piracy and Network Externalities. โรงพิมพ์มหาวิทยาลัยธรรมศาสตร์:ม.ป.ท. 2551.