DJVU PDF Pirya Krairiksh. 1991, "Towards a revised history of Sukhothai art: a reassessment of the inscription of King Ram Khamhaeng", in The Ram Khamhaeng Controversy, ed. J.R. Chamberlain, pp. 53-160. The Siam Society. cite.

DJVU PDF Pirya Krairiksh. 1991, "The date of the Ram Khamhaeng inscription", in The Ram Khamhaeng Controversy, ed. J.R. Chamberlain, pp. 257-272. The Siam Society. cite.

DJVU PDF Pirya Krairiksh. 1991, "An epilogue to the Ram Khamhaeng inscription", in The Ram Khamhaeng Controversy, ed. J.R. Chamberlain, pp. 553-565. The Siam Society. cite.