References:

Books

1 The Orders and Medals of the Communist Governments of Indochina, by John Sylvester Jr., Revision I, August 1, 1992
2 The Orders and Medals of the Communist Governments of Indochina, by John Sylvester Jr., Revision II, January 1, 1994
3 The Orders and Medals of Cambodia and Laos, Revised, by John Sylvester Jr. and Edward J. Emering, April 2001 (not published)
4 Cambodian Decorations of Honor, by Geoffrey P. Oldham and Brett Delahunt, 2004. Available at http://www.milimem.com
5 Cambodian Decorations of Honor, by Cambodian Royal Decorations Department, ~2010. (Based on the book by Geoffrey P. Oldham and Brett Delahunt, but in Khmer.)
6 Kampuchea Uniforms and Insignia, 1979 to 1993, by Geoffrey P. Oldham, 2007. Available at http://www.milimem.com
7 Unknown booklet on Kampuchean medals from late 1990's. (If anyone has a copy, I'd like to obtain one)

Websites

1 The Orders and Medals Society of America (OMSA) - Medals database for PRK http://www.omsa.org/photopost/showgallery.php?cat=1002
2 Ribbons of the World website - Cambodia page, by Antonio Prieto Barrio http://www.coleccionesmilitares.com/cintas/asia/campuchea.gif
3 Rusty Knight's Place website - Cambodia page, by M. Devine http://rustysmedals.rustyknight98.com/Cambodia.htm
4 See also posts at the Soviet Medals Forum http://soviet-awards.com/forum/soviet-bloc-awards/soviet-sphere/democratic-kampuchea/