Roberts, V. (2008). British poultry standards: Complete specifications and judging points of all standardized breeds and varieties of poultry as compiled by the specialist breed clubs and recognised by the Poultry Club of Great Britain (6th ed.). Blackwell Publishing.
Chicago Style (17th ed.) CitationRoberts, Victoria. British Poultry Standards: Complete Specifications and Judging Points of All Standardized Breeds and Varieties of Poultry as Compiled by the Specialist Breed Clubs and Recognised by the Poultry Club of Great Britain. 6th ed. Oxford: Blackwell Publishing, 2008.
MLA (9th ed.) CitationRoberts, Victoria. British Poultry Standards: Complete Specifications and Judging Points of All Standardized Breeds and Varieties of Poultry as Compiled by the Specialist Breed Clubs and Recognised by the Poultry Club of Great Britain. 6th ed. Blackwell Publishing, 2008.