Bui Xuan Men, Ogle B and  Preston T R 2008 Recycling  organic  wastes  to  produce  earthworms as a protein supplement in diets for poultry and fish.  Proceedings MEKARN Regional Conference 2007: Matching Livestock Systems with Available Resources (Editors: Reg Preston and Brian Ogle), Halong Bay, Vietnam, 25-28 November 2007 http://www.mekarn.org/prohan/menbx.htm