Journal Article
Fleming I.  1988.  Communication analysis: A stratificational approach. Dallas: Summer Institute of Linguistics.
Yukawa Y.  1979.  A tentative questionnaire for the words of Bantu languages. Journal of Asian and African Studies. 17:139–212.
Premsrirat S.  2002.  Thesaurus and Dictionary Series of Khmu dialects in Southeast Asia. Mon-Khmer Studies-Mahidol University Special Publications.