Selvia Lirita และ Yingyot Chiaravutthi. (2010) The a doption of smart phones and network externalities. Mahidol University:ม.ป.ท.Selvia Lirita และ Yingyot Chiaravutthi. 2010. The a doption of smart phones and network externalities. ม.ป.ท.:Mahidol University;Selvia Lirita และ Yingyot Chiaravutthi. The a doption of smart phones and network externalities. ม.ป.ท.:Mahidol University, 2010. Print.