1. Official Methods of Analysis of AOAC International,2005
2. Calcium logistics in the laying hen;Etches;J. Nutr.,1987
3. Chapter 36: Cartilage, bones and joints;Goff,2003
4. Absorption of calcium and phosphorus along the gastrointestinal tract of the laying fowl as influenced by dietary calcium and egg shell formation;Hurwitz;J. Nutr.,1965
5. Hy-Line International. 2016. Pages 1–44 in Hy-Line W-36 Commercial Layers Management Guide. Hy-Line International is located in Dallas Center, IA, USA