DJVU PDF WALLACE, Judith M. 1966. Katu personal pronouns. MKS 2:55-62.
DJVU PDF COSTELLO, Nancy A. 1966. Affixes in Katu. MKS 2:63-86.
DJVU PDF COSTELLO, Nancy A. 1969. The Katu noun phrase. MKS 3:21-35.
DJVU PDF COSTELLO, Nancy A. and Khamluan SULAVAN. 1996. Preliminary statement of Katu orthography in Lao script. MKS 26:233-244.
DJVU PDF COSTELLO, Nancy A. 1998. Affixes in Katu of the Lao P.D.R. MKS 28:31-42.
DJVU PDF COSTELLO, Nancy A. 2000. Dialect differences for Katu prepositional phrases. MKS 30:65-73.
DJVU PDF COSTELLO, Nancy A. 2001. Aspect and tense in Katu of the Lao PDR. MKS 31:121-125.