Books:
(incomplete, will be updated regular)
o Terry E. Miller: “Traditional Music of the Lao: Kaen Playing and Mawlum Singing in Northeast Thailand"
More Information + Order: Here
o Amy Catlin, Eran Fraenkel: “Selected Reports in Ethnomusicology: Text, Context, and Performance in Cambodia, Laos, and Vietnam"
More Information + Order: Here
o Hakan Lundstrom: “I Will Send My Song: Kammu Vocal Genres in the Singing of Kam Raw"
More Information + Order: Here
o Hakan Lundstrom: “Kammu Songs: The Songs of Kam Raw” (Kammu Worlds S.)
More Information + Order: Here

http://www.infography.com/content/623991186555.html  
A short list of according literature

CDs:
Reviews and audiofiles only, please ask the author for an Amazon.com list of CDs
http://www.arhoolie.com/titles/446.shtml  
Audio examples of the CD “Boua xoua mua” containing songs of the Hmong in Laos
http://www.asianclassicalmp3.org/laos.htm    
Audioexamples in MP3 format comparing two CDs of traditional Lao music
http://trfn.clpgh.org/free-reed/reviews/laos.html  
Interesting review of the audio CD “Music of Laos”
http://www.ocf.berkeley.edu/~kongsab/  
Four audiofiles (at the bottom of the page) of traditional Lao music