1. Wheeler, W. P., N. Y. State Bull. No. 242.
2. Brown—Races of Domestic Poultry, p. 14.
3. Kaupp—Poultry Culture, 2nd Ed., p. 253.
4. Jull, M. A., Jour. Am. Ass. of Inst. & Invst. in Poultry Husb. Vol. 2, No. 2, p. 14.
5. Zaitschek, A., Archiv. Physiol. (Pflüger) No. 9-12, p. 608.