Chanachai Phodoung และ Supong Tangkiengsirisin. (2009) Attitudes toward marketing factors influencing MP3 player purchasing decisions in adults. Language Institute, Thammasat University,:ม.ป.ท.Chanachai Phodoung และ Supong Tangkiengsirisin. 2009. Attitudes toward marketing factors influencing MP3 player purchasing decisions in adults. ม.ป.ท.:Language Institute, Thammasat University,;Chanachai Phodoung และ Supong Tangkiengsirisin. Attitudes toward marketing factors influencing MP3 player purchasing decisions in adults. ม.ป.ท.:Language Institute, Thammasat University, 2009. Print.