DJVU PDF Friberg, T. and Hor, K. 1977, "Register in Western Cham Phonology", in Papers in Southeast Asian Linguistics No.4, Chamic Studies, ed. D. Thomas et al., vol. 4, pp. 17-38. Pacific Linguistics, the Australian National University. cite.

DJVU PDF Lee, E.W. 1977, "Devoicing, Aspiration, and Vowel Split in Haroi: Evidence for Register (Constrastive Tongue-Root Position)", in Papers in Southeast Asian Linguistics No.4, Chamic Studies, ed. D. Thomas et al., vol. 4, pp. 87-104. Pacific Linguistics, the Australian National University. cite.