DJVU PDF Diller, A. 1992, "On the history of tone-marking in Asian languages", in The Third International Symposium on Language and Linguistics, Bangkok, Thailand, pp. 628-638. Chulalongkorn University. cite.

DJVU PDF Theraphan L-Thongkum. 1988, "Another look at the register distinction in Mon", in The International Symposium on Language and Linguistics, ed. C. Bamroongraks et al., Bangkok, Thailand, pp. 22-51. Thammasat University. cite.