Narongsak Comepa และ Kongkiti Phusavat. (2012) Productivity measurement and analysis : adapting intellectual capital for manufacturing firms. Kasetsart University,:ม.ป.ท.Narongsak Comepa และ Kongkiti Phusavat. 2012. Productivity measurement and analysis : adapting intellectual capital for manufacturing firms. ม.ป.ท.:Kasetsart University,;Narongsak Comepa และ Kongkiti Phusavat. Productivity measurement and analysis : adapting intellectual capital for manufacturing firms. ม.ป.ท.:Kasetsart University, 2012. Print.