1. The Unscrambler version 9.7;CAMO.,2007
2. CIE. 1978. Recommendations on uniform colour spaces, colour difference equations, psychometric colour terms. CIE Publication (15 (E-1.3.1) 1971/(TO-1.3) (Suppl. 15). Bureau Central de la CIE, Paris, France.
3. Dunn I. C. 2013. Long life layer: Genetic and physiological limitations to extend the laying period. Pages 124–129 in Proc. 19th Europ. Symp. Poult. Nutr., Potsdam, Germany.
4. Polymorphisms in eggshell organic matrix genes associated with eggshell quality measurements in pedigree Rhode Island Red hens;Dunn;Anim. Genet.,2009
5. A market study on the quality characteristics of eggs from different housing systems;Hidalgo;Food Chem.,2008