1. Xanthophyll determinations in dehydrated alfalfa meal;Bischoff;J. Assoc. Off. Agr. Chem.,1954
2. Bunnell, R. H., and J. C. Bauernfeind 1958. Carotenoids as poultry pigmenters. Proceedings of the 8th World's Poultry Congress. Mexico City.
3. Do you want dark colored egg yolks?;Carlson;Poultry Processing and Marketing,1961
4. Studies on carotenoid metabolism;Deuel;IV. The effect of vitamin A intake on the carotenoid and vitamin A content of the eggs, liver, blood and body fat of hens. J. Nutrition,1943
5. The Haugh unit for measuring egg quality;Haugh;U. S. Egg Poultry Magazine,1937