1. Statistical Analysis System (A User's Guide by Jolayne Service);Barr,1972
2. As cited by Romanoff (1960). Extraembryonic Membranes;Byerly,1932
3. Pigmentation-light screen or camouflage;Coleman;Virginia J. Sci.,1971
4. The effect of light on the acid soluble nucleotide pool of the chick embryo;Coleman;Poultry Sci.,1974
5. Effect of light during incubation on hatchability of turkey eggs;Cooper;Poultry Sci.,1972