DJVU PDF Wayland, R. 1998, "An acoustic study of Battambang Khmer vowels", in The Mon-Khmer Studies Journal, vol. 28, pp. 43-62. cite.
DJVU PDF Naraset Pisitpanporn. 1998, "Khmer vowels in transition", in The Mon-Khmer Studies Journal, vol. 28, pp. 160-162. cite.