Roget P.  1989.  Top Pocket Roget's Thesaurus of English Words and Phrases. Longman Top Pocket Series. :640.

• Google Scholar

Yukawa Y.  1979.  A tentative questionnaire for the words of Bantu languages. Journal of Asian and African Studies. 17:139–212.

• Google Scholar

Premsrirat S.  2002.  Thesaurus and Dictionary Series of Khmu dialects in Southeast Asia. Mon-Khmer Studies-Mahidol University Special Publications.

• Google Scholar

Hohulin L.  1994.  Tuwali Ifugao dictionary.

• Google Scholar