1. Untersuchungen uber den natriumbedarf von kuchen und uber die forgen einer fast natriumfreien futterung [Studies on sodium requirements of chickens and on consequences of a diet almost free in sodium];Sjollema;Bierderman's Zentralb. B. Tierernahrung,1935
2. The effects of sodium deprivation on the animal organism;Orent-Keiles;Am. J. Physiol.,1937
3. Nutrient Requirements of Poultry;National Research Council,1984
4. Nutrient Requirements of Poultry;National Research Council,1994
5. Ross 308, Ross Poultry Breeders, Elkmont, AL 35620.