Manit Vallibhotama, "Muang U-Thong", Muang Boran Journal, Volume 14, no.1, January–March 1988, pp.29-44; Sisak Wanliphodom, Suwannaphum yu thi ni, Bangkok, 1998; Warunee Osatharom, Muang Suphan Through Changing Periods, Bangkok, Thammasat University Press, 2004; The Siam Society, Miscellaneous Articles Written for the JSS by His Late Highness Prince Damrong, The Siam Society, Bangkok, B.E. 2505 (1962); William J. Gedney, “A Possible Early Thai Route to the Sea”, Journal of the Siam Society, Volume 76, 1988, pp.12-16.[1]เก็บถาวร 2016-12-30 ที่ เวย์แบ็กแมชชีน
Manit Vallibhotama, "Muang U-Thong", Muang Boran Journal, Volume 14, no.1, January–March 1988, pp.29-44; Sisak Wanliphodom, Suwannaphum yu thi ni, Bangkok, 1998; Warunee Osatharom, Muang Suphan Through Changing Periods, Bangkok, Thammasat University Press, 2004; The Siam Society, Miscellaneous Articles Written for the JSS by His Late Highness Prince Damrong, The Siam Society, Bangkok, B.E. 2505 (1962); William J. Gedney, “A Possible Early Thai Route to the Sea”, Journal of the Siam Society, Volume 76, 1988, pp.12-16.[1]เก็บถาวร 2016-12-30 ที่ เวย์แบ็กแมชชีน