1. Alexander, G.I., Reason, G.K. and Clark, C.H., 1984a. The development of the Australian Friesian Sahiwal. A tick-resistant dairy breed. World Anim. Rev. 51:27?34.
2. Alexander, G.I., Reason, G.K., Gale, G.M.R. and Clark, C.H., 1984b. The performance of Australian Friesian Sahiwal cattle. World Anim. Rev., 52:13?16.
3. Anonymous, 1987. SAS/STAT Guide for Personal Computers. SAS Institute Inc., Cary, NC, 1028 pp.
4. Bonsma, J.C., 1944. Hereditary heartwater-resistant characters in cattle. Farming S. Afr. 19:71?96.
5. Bonsma, J.C., 1981. Breeding tick-repellent cattle. In: Tick Biology and Control. Proc. Int. Conf., Tick Biology and Control, Grahamstown South Africa, 27?29 January 1981. Rhodes Univeristy Grahamstown, pp. 79?85.