Books:
o David Morton: “The Traditional Music of Thailand”
More Information + Order: Here
o Deborah Wong: “Sounding the Center : History and Aesthetics in Thai Buddhist Performance”  
More Information + Order: Here
o Terry E. Miller: “Traditional Music of the Lao: Kaen Playing and Mawlum Singing in Northeast Thailand”
More Information + Order: Here
o Andrew C. Shariari: “Khon Muang - Music and Dance traditions of Northern Thailand"
More Information + Order: Here

http://bookstore.mythailandcenter.com/n_031324765X.htm
A book review of “Traditional music of the Lao in Thailand” written by Terry E. Miller

http://www.seasite.niu.edu/Thai/music/classical/introduction.htm
A short excerpt from the book “The music of Thailand” written by David Morton

http://www.thaibuch.de/indexe.asp?rubrik=21
A list of books and CDs available on Amazon, etc.

CDs:
o Bamboo on the Mountains:  Khmu Highlanders from Southeast Asia  
More Information + Order: Here
o The Piphat: Siamese Classics Vol.1  
More Information + Order: Here
o The rough guide to the music of:  Thailand (nice sampler ranging from Pop to classic)  
More Information + Order: Here