1. Wright, L., New Book of Poultry. London (Cassell) 1905.
2. The American Standard Perfection. A Complete Description of all Recognized Varieties of Fowls. Published by the American Poultry Association. 1906. pp. 299.
3. Spillman, W. J., Barring in Barred Plymouth Rocks. Poultry. Vol. 5. No. 11. August 1909. pp. 7, 8.
4. —, Spurious Allelomorphism: Results of Some Recent Investigations. Amer. Nat. Vol. XLII. 1909. pp. 610–615.
5. Goodale, H. D., Sex and its Relation to the Barring Factor in Poultry. Science. N. S. Vol. 29. No. 756. 1909. pp. 1004, 1005.