REFERENCES
- Gericke A. M. 1934—The thyroid and other endocrine glands in relation with plumage colors in fowls. S. A. Journal of Sci. XXXI: 415–424.
- Gericke A. M. 1934—Two Black Australorp hens which turned white in color. S. A. Journal of Sci. XXXI: 425–432.
- Nelson, Norman M. 1947—Normal eye color in the chicken. Poultry Sci. XXVI: 1: 61–66
- Slinger, S. J. and J. J. Macilraith 1944—The correlation between green-grey irises and black feathers in Barred Plymouth Rock pullets. Poultry Sci. XXIII: 6: 533–537.
- Sturkie, Paul D., C. B. Godbey and R. M. Sherwood 1937—The inheritance of shank color in chicks. Poultry Sci. XVI: 3: 183–188.