1. Anonymous, U.S.D.A., 1969, Agricultural statistics.
2. Anonymous, U.S.D.A., 1970. Economic Research Service, Poultry and egg situation.
3. How much is egg breakage costing you?;Cox;Poultry Tribune,,1967
4. Grotts, R. E., J. V. Spencer, M. H. George and D. W. Miller, 1957. Effect of preserving shell eggs by coating with plastics and other compounds. W.S.C. Poultry Council Proceedings, Exp. No. 2-56, p. 144-146.
5. Haines, R. B., 1939. Dept. Sci. Ind. Research (Brit.), Food Invest., Spec. Reports 47: 1-65. Cited from Romanoff and Romanoff (1949).