1. Investigation on the strength of hens' eggs;Baskett;J. Min. Agric. N. Ireland,1937
2. Strength of the shell of the hens' egg;Brooks;Nature,1955
3. Effect of washing on the keeping quality of hens' eggs;Bryant;J. Agric. Res.,1934
4. Sampling Techniques;Cochran,1953
5. Shell color as a measure of egg shell quality;Godfrey;Poultry Sci.,1949