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2. Growth and development of lambs;Black,1983
3. Blood, D.C., Radostits, O.M., 1989. Veterinary Medicine. A Textbook of the diseases of Cattle, Sheep, Pigs, Goats and Horses, 7th edition, pp 1160–1175, 1264–1268. Baillière Tindall. London.
4. Protective effect of zinc supplementation against copper toxicosis in sheep;Bremner;British Journal of Nutrition,1976
5. Effect of floor type and dietary molybdenum content on the liver copper concentration at slaughter and performance of intensively finished lambs;Crosby;Livestock Production Science,2004