National Research Council (U.S.). Subcommittee on Sheep Nutrition. (1985). Nutrient requirements of sheep (6th rev. ed.). National Academy Press.

National Research Council (U.S.). Subcommittee on Sheep Nutrition. Nutrient Requirements of Sheep. 6th rev. ed. Washington, D.C.: National Academy Press, 1985.

National Research Council (U.S.). Subcommittee on Sheep Nutrition. Nutrient Requirements of Sheep. 6th rev. ed. National Academy Press, 1985.