1. Hew, P, Y, and R. I. Hutagalung. 1980. First Asian-Australasian Animal Science Congress, Abstr. No. 75, p. 24.
2. Hill, R. R. Thambyah, S, P. Wan and C. S. Shanta. 1962. J. Agric. Sci. 59: 409–415.
3. Jainudeen, M, R. 1977. Proc. Conf. Health & Prod, of Local & Australian Cattle in Southeast Asia. Ministry of Agric. Malaysia. Bull. No. 146, p. 162–169.
4. Jainudeen, M, R., R. I. Hutagalung and S. Dass. 1980. First Asian-Australasian Animal Science Congress. Abstr. No. 125, p. 38.
5. Lebdosoekojo, S., C. B. Ammerman, N. S. Raun, J, Gomez and R. C. Littell. 1980. J. Animal Sci. 51: 1249–1260.