Philippine Council for Agriculture and Resources Research and Development; Mabbayad, B.B.(College of Agriculture, UP at Los Baños, Los Baños, PH, 1982)
Agency for Agricultural Research and Development; University of the Philippines at Los Baños, Institute of Animal Science; Philippines. Dept. of Agriculture and Natural Resources; Thailand. Dept. of Agriculture; IRRI(1988)
Philippine Council for Agriculture, Forestry and Natural Resources Research and Development; University of the Philippines at Los Baños; Philippines. Bureau of Plant Industry(Institute of Plant Breeding, University of the Philippines, Los Baños, 1980)