1. Cerrate, S. Z. 2008. Choice feeding as a means of identifying differences in nutritional needs of broilers. PhD Diss. Univ. Arkansas, Fayetteville.
2. Feeds and Feeding: A Handbook for the Student and Stockman;Morrison,1956
3. 7 C.F.R. § 205.603 Synthetic substances allowed for use in organic livestock production.
4. IFOAM. 2012. The Principles of Organic Agriculture. Accessed Aug 2012. http://infohub.ifoam.org/en/ifoam-standard.
5. Naked neck meat chickens, S and G Poultry, Canton, AL.