Rasmussen, Mark A., Sara A. Cutler, Kelly Wilhelms, and Colin G. Scanes. 2007. “Effects of Bt (Bacillus Thuringiensis) Corn on Reproductive Performance in Adult Laying Hens”. International Journal of Poultry Science 6 (3): 169–171. https://doi.org/10.3923/ijps.2007.169.171.