1. Official Methods of Analysis;Association of Official Agricultural Chemists,1970
2. Alteration of egg yolk color by diet.;Farr;Poultry Sci.,1961
3. Hinton, C. F., III, 1971. Evaluation of Methods of Measuring Carotenoid Levels in Egg Yolk. Master’s Thesis, University of Florida.
4. Yolk color resulting from different levels of paprika extract in the ration.;Mackay;Poultry Sci.,1963
5. Morgan, W. A., and I. G. Woodroof, 1927. Waste pimento pepper for coloring egg yolks. Georgia Agr. Exp. Sta. Bull. No. 147.