Chamberlain, J.R. 1991, "Introduction", in The Ram Khamhaeng Controversy, ed. J.R. Chamberlain, pp. xi-xvi. The Siam Society. cite.

DJVU PDF Chamberlain, J..R. 1991, "The efficacy of the P/PH distinction for Tai Languages", in The Ram Khamhaeng Controversy, ed. J.R. Chamberlain, pp. 453-486. The Siam Society. cite.