Nguyen Thi Thuy and Ogle B 205: The effect of supplementing different green feeds (water spinach, sweet potato leaves and duckweed) to broken rice based diets on performance, meat and egg yolk colour of Luong Phuong chickens.Workshop-seminar "Making better  use of local feed resources" (Editors: Reg Preston and Brian Ogle) MEKARN-CTU, Cantho, 23-25 May, 2005. Article #33. Retrieved, from http://www.mekarn.org/proctu/thuy33.htm