1. A Single Comb White Leghorn pullet with two ovaries and oviducts;Bryant;Poultry Sci.,1944
2. A case of paired oviducts in the chicken;Champion;Poultry Sci.,1955
3. Paired oviducts in the fowl;Crew;J. Anat.,1931
4. Poultry Diseases;Kaupp,1922
5. Fourth annual international egg laying contest;Kirkpatrick;Storrs Agricultural Experiment Station Bulletin,1916