Sao N V, Mui N T and Binh Đ V 2010: Biomass production of Tithonia diversifolia (Wild Sunflower), soil improvement on sloping land and use as high protein foliage for feeding goats. Livestock Research for Rural Development. Volume 22, Article #151. Retrieved , from http://www.lrrd.org/lrrd22/8/sao22151.htm