Nachanok Hutanan และ Ketvalee Porkaew. (2009) Manual reading behavior among mobile phone users who work in Silom Sub-district /. Language Institute, Thammasat University,:ม.ป.ท.Nachanok Hutanan และ Ketvalee Porkaew. 2009. Manual reading behavior among mobile phone users who work in Silom Sub-district /. ม.ป.ท.:Language Institute, Thammasat University,;Nachanok Hutanan และ Ketvalee Porkaew. Manual reading behavior among mobile phone users who work in Silom Sub-district /. ม.ป.ท.:Language Institute, Thammasat University, 2009. Print.