Satit Trithipwanich และ Pattama Sappapan. (2009) Foreign tourists' satisfaction with the personal audio guide (PAG) at the Grand Palace and the Temple of the Emerald Buddha. Thammasat University:ม.ป.ท.Satit Trithipwanich และ Pattama Sappapan. 2009. Foreign tourists' satisfaction with the personal audio guide (PAG) at the Grand Palace and the Temple of the Emerald Buddha. ม.ป.ท.:Thammasat University;Satit Trithipwanich และ Pattama Sappapan. Foreign tourists' satisfaction with the personal audio guide (PAG) at the Grand Palace and the Temple of the Emerald Buddha. ม.ป.ท.:Thammasat University, 2009. Print.